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BEGIN:VEVENT
SUMMARY:Progress in thimble regularization: a new algorithm\, 0+1 QCD and
beyond
DTSTART;VALUE=DATE-TIME:20160802T111500Z
DTEND;VALUE=DATE-TIME:20160802T114000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2948@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Di Renzo (University of Parma and INFN)\nI
n the context of the chiral random matrix model we introduced a way to com
pute lattice quantum field theories on Lefschetz thimbles by taking into a
ccount the contributions to the functional integral which come from comple
te flow lines. The latter are the steepest ascent paths attached to critic
al points\, i.e. the basic building blocks of thimbles. While the thimble
regularization was successfull in solving the chiral random matrix model\,
the simulating algorithm we first made use of was the roughest one could
devise\, i.e. static\, crude Monte Carlo. The static\, crude Monte Carlo w
as also useful in solving QCD in 0+1 dimensions at finite chemical potenti
al\, whose results we will present in the talk. We have also come up with
a new algorithm\, which is based on a heat bath sampling of the gaussian a
pproximation of the thimble: this defines the proposals for a Metropolis-l
ike accept/reject step. We present this new algorithm\, showing its effect
iveness in the case of the chiral random matrix model and discussing appli
cations to other theories. In particular\, we are going to address the iss
ues and the formalism for thimble regularization of Yang Mills theory in 2
dimensions with complex coupling.\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/530/contributions/2948/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2948/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new method to determine the topological susceptibility at high-t
emperature
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2949@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Julien Frison (KEK Theory Center)\nAt $T>T_c$\, the
topological susceptibility quickly drops down\, although the precise speed
of this fall is still subject to theoretical debates. It then becomes pra
ctically impossible for lattice QCD to handle volumes large enough to allo
w non-trivial topology and a precise sampling of the sectors involved in t
he $\\theta=0$ vacuum. We present a new method applicable to the computati
on of the decrease of the susceptibility on a wide range of situations\, i
ncluding in particular finite-temperature ensembles with $\\chi_t\\ll 1/V$
. This method distinguishes itself from most other methods by not relying
on the $\\theta=0$ vacuum\, nor any semi-classical approximation around $\
\theta=0$\, but only on topology-fixed configurations. We will provide som
e encouraging preliminary results on quenched ensembles\, and discuss the
generalisation to any simulation.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/530/contributions/2949/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2949/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral phase transition in (2 + 1)-flavor QCD
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2950@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sheng-Tai Li (Central China Normal University)\nWe p
resent our recent results on the chiral phase transition in 2+1 flavor QCD
on lattices with temporal extent $N_{\\tau} = 6$. We have performed latti
ce QCD simulations using the Highly Improved Staggered Quarks with 5 diffe
rent values of pion masses\, i.e. 160\, 140\, 110\, 90\, 80 MeV in a tempe
rature window from 140 MeV to 170 MeV. We have analyzed the universal scal
ing behaviour of the chiral phase transition at vanishing baryon chemical
potential by looking into the temperature and quark mass dependences of th
e chiral condensates of chiral susceptibilities. The window of criticality
compared to previous studies is also discussed.\n\nhttps://conference.ipp
p.dur.ac.uk/event/530/contributions/2950/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2950/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parity doubling in two-color and two-flavor gauge theory at high t
emperature
DTSTART;VALUE=DATE-TIME:20160803T141000Z
DTEND;VALUE=DATE-TIME:20160803T143500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2951@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jong-Wan Lee (Swansea University)\nRecently the two-
color gauge theory with two flavors of fundamental fermions has received c
onsiderable attention in BSM model building\, as it provides a minimal tem
plate for a composite Higgs theory that includes dark matter candidates. I
n this work\, we consider the two-color model with two flavors of Wilson f
ermions at non-zero temperature. For a more reliable investigation of meso
n correlation functions at high temperature\, we perform simulations on an
isotropic lattices with a target anisotropic factor of a_s/a_t=6.3. The tu
ning of bare parameters was carried out using the pseudo-scalar dispersion
relation and Wilson loop ratios. We present our preliminary results for t
he identification of parity doubling from the temporal and spacial correla
tion functions of vector and axial-vector mesons.\n\nhttps://conference.ip
pp.dur.ac.uk/event/530/contributions/2951/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2951/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The lattice CP(N-1) phase diagram
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2952@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tobias Rindlisbacher (ETH Zürich)\nWe recently prop
osed a new type of worm algorithm for simulating the CP(N-1) model at fini
te density in a dual representation based on flux-variables. Here we conti
nue by discussing how a topological term can be incorporated into our dual
formulation.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contributions
/2952/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2952/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QED with dual variables
DTSTART;VALUE=DATE-TIME:20160802T091000Z
DTEND;VALUE=DATE-TIME:20160802T093500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2953@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Helvio Vairinhos (ETH Zurich)\nWith the help of auxi
liary fields\, it is possible to integrate out analytically the link varia
bles in lattice gauge theory with staggered fermions\, for arbitrary value
s of the lattice coupling. In the case of N_f=1 QED\, the subsequent Grass
mann integration yields a dual representation of the partition function\,
which traces over an ensemble of monomers\, dimers\, and electron loops co
upled to the auxiliary fields. We simulate this system using diagrammatic
Monte Carlo methods\, and explore the residual sign problem which survives
after all the analytical integrations.\n\nhttps://conference.ippp.dur.ac.
uk/event/530/contributions/2953/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2953/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phenomenological signals of QCD critical point in heavy-ion collis
ions
DTSTART;VALUE=DATE-TIME:20160801T090000Z
DTEND;VALUE=DATE-TIME:20160801T092500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2954@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Akihiko Monnai (Institut de Physique Théorique\, CN
RS/CEA)\nThe properties of a QCD medium at finite density is extensively s
tudied in the recent beam energy scan program at BNL Relativistic Heavy Io
n collider. One of the main goals of the program is to understand the QCD
phase structure and to verify the existence of a critical point. A difficu
lty in such analyses is that a signal of the critical point could be therm
ally washed away if its location is far from the freeze-out\, unless its e
ffects on dynamical evolution is sizable enough to modify the freeze-out h
ypersurface.\n\nThe relativistic hydrodynamic model has been proven to be
a powerful tool for heavy-ion analyses in the past decades. In this study\
, we propose to extend the model to lower energies at finite density and e
stimate thermal photon spectra and flow harmonics. Since the medium is ele
ctromagnetically transparent\, there is an advantage that the critical poi
nt does not have to be near the freeze-out for its photonic signal to be d
etectable. We present the results from (2+1)-dimensional hydrodynamic simu
lation and discuss their phenomenological consequences.\n\nhttps://confere
nce.ippp.dur.ac.uk/event/530/contributions/2954/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2954/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice constraints on the thermal photon rate
DTSTART;VALUE=DATE-TIME:20160801T130000Z
DTEND;VALUE=DATE-TIME:20160801T132500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2955@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Olaf Kaczmarek (University of Bielefeld)\nWe estimat
e the photon production rate from an SU(3) plasma at\ntemperatures of abou
t $1.1~T_c$ and $1.3~T_c$. Lattice results for the\nvector current correla
tor at spatial momenta $k\\sim (2-6)T$ are\nextrapolated to the continuum
limit and analyzed with the help of a\npolynomial interpolation for the co
rresponding spectral function\,\nwhich vanishes at zero frequency and matc
hes to high-precision\nperturbative results at large invariant masses. For
small invariant\nmasses the interpolation is compared with the NLO weak-c
oupling\nresult\, hydrodynamics\, and a holographic model. At vanishing in
variant\nmass we extract the photon rate which for $k \\sim 3T$ is found t
o be\nclose to the NLO weak-coupling prediction. For $k \\sim 2T$\nuncerta
inties remain large but the photon rate is likely to fall below\nthe NLO p
rediction\, in accordance with the onset of a strongly\ninteracting behavi
our characteristic of the hydrodynamic regime.\n\nhttps://conference.ippp.
dur.ac.uk/event/530/contributions/2955/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2955/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Confinement and Magnetic Fields
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2956@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Sanfilippo (University of Southampton)\nOn
e of the greatest achievement of lattice QCD is the numerical determinatio
n of the confinement potential between pairs of static quarks\, as well as
the measurement of the shape of the color-flux tube connecting them. In t
his talk I will present how this is modified in the presence of a magnetic
field.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contributions/2956/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2956/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Observables for study of the deconfinement transition
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2957@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Saumen Datta (Tata Institute of Fundamental Research
)\nThe deconfinement transition is typically studied using the Polyakov lo
op\,\nwhich needs renormalization. We look at the renormalization of Polya
kov loop\nusing Wilson flow\, for both quenched and $N_f=2$ QCD. We also i
nvestigate \nsome observables related to the Polyakov loop that has been s
uggested\, and \nthe behavior of the gluon condensate across the transiti
on.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contributions/2957/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2957/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening
DTSTART;VALUE=DATE-TIME:20160801T080000Z
DTEND;VALUE=DATE-TIME:20160801T081500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2959@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kurt Langfeld (Plymouth University)\nhttps://confere
nce.ippp.dur.ac.uk/event/530/contributions/2959/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2959/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The QCD equation of state and fluctuations of conserved charges at
non-vanishing temperature and density
DTSTART;VALUE=DATE-TIME:20160803T084500Z
DTEND;VALUE=DATE-TIME:20160803T091000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2960@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christian Schmidt (Universitaet Bielefeld)\nWe prese
nt results from a calculation of the QCD equation of state up\nto the sixt
h order in the baryon number\, strangeness and electric charge\nchemical p
otentials. We consider various cases to express strangeness\nand electric
charge chemical potentials as function of the baryon\nchemical potential a
nd temperature. Among those\, the conditions met in\nheavy ion collision a
re best reproduced by enforcing strangeness\nneutrality and a constant bar
yon number to electric charge ratio. We\nwill further discuss how cumulant
rations of conserved charge\nfluctuations that are available in both\, la
ttice QCD simulations and\nheavy ion experiments\, can be used to determin
e freeze-out parameters\nincluding the freeze-out curvature of the experim
ent.\n\nThe presented results are based on lattice calculations performed
with\nthe Highly Improved Staggered Quark action (HISQ) in the temperature
\nrange 140 MeV \n\nhttps://conference.ippp.dur.ac.uk/event/530/contributi
ons/2960/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2960/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The phase diagram of QCD with isospin chemical potential
DTSTART;VALUE=DATE-TIME:20160803T105000Z
DTEND;VALUE=DATE-TIME:20160803T111500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2961@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bastian Brandt (University of Frankfurt)\nWe investi
gate the phase diagram of QCD at finite isospin chemical potential using 2
+1 flavours of staggered fermions with physical quark masses at different
lattice spacings and volumes. For high chemical potentials and low tempera
tures the confined phase shows a transition to the pion condensation phase
. This phase is characterised by a proliferation of low modes that slow do
wn the simulation considerably and necessitate the use of an infrared regu
lator. We discuss a novel strategy to determine the pion condensate in the
limit of vanishing regulators. To investigate the convergence properties
and the range of validity of the Taylor expansion method at a given order\
, we compare our results to the Taylor expansion for finite isospin chemic
al potential at 4 derivative order. This can serve as an important crossch
eck for the Taylor expansion method at finite baryon chemical potential\,
where direct simulations are impossible due to the sign problem.\n\nhttps:
//conference.ippp.dur.ac.uk/event/530/contributions/2961/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2961/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex spectrum of QCD at finite density
DTSTART;VALUE=DATE-TIME:20160802T134500Z
DTEND;VALUE=DATE-TIME:20160802T141000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2963@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hiromichi Nishimura (RIKEN BNL Research Center)\nWe
consider the spectrum of transfer matrix eigenvalues associated with Polya
kov loops in lattice QCD at strong coupling. The transfer matrix at finit
e density is non-Hermitian\, and its eigenvalues become complex as a manif
estation of the sign problem. We show that the global symmetries of finit
e-density QCD ensure that the complex eigenvalues are part of a complex co
njugate pair\, and they lead to sinusoidally modulated decay in Polyakov l
oop correlation functions. We argue that the results reflect oscillatory
behavior in color-charge densities reminiscent of density-density correlat
ion functions in liquids\, and it is generic in spin models for QCD at fin
ite density\, as well as phenomenological models using complex saddle poin
ts.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contributions/2963/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2963/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmonium spectral functions from large quenched lattice QCD
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2964@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Haitao Shu (CCNU)\nWe present our most updated resul
ts on the charmonium correlation and spectral functions. The correlation f
unctions are obtained using the clover improved Wilson fermions on quenche
d lattices with spatial size fixed to 192. And temporal sizes of these lat
tices are chosen to be 96\, 64\, 56\, 48 and 32 corresponding to 0.73\, 1.
1\, 1.25\, 1.5 and 2.2 Tc. We perform a detailed analysis of these charmon
ium correlators using two different stochastic approaches\, namely Stochas
tic Analytical Inference (SAI) and Stochastic Optimization Method (SOM) to
extract the spectral functions. The systematic uncertainties in spectral
functions obtained from SOM and SAI will be discussed\, and the comparison
s with those from Maximum Entropy Method (MEM) also will be presented.\n\n
https://conference.ippp.dur.ac.uk/event/530/contributions/2964/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2964/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite temperature lattice QCD review
DTSTART;VALUE=DATE-TIME:20160803T100500Z
DTEND;VALUE=DATE-TIME:20160803T105000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2965@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daniel Nogradi (Eotvos University)\nI will review re
cent numerical results as well as new ideas and approaches to finite tempe
rature lattice QCD at zero chemical potential.\n\nhttps://conference.ippp.
dur.ac.uk/event/530/contributions/2965/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2965/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Competing order in the fermionic Hubbard model on the hexagonal gr
aphene lattice
DTSTART;VALUE=DATE-TIME:20160801T104000Z
DTEND;VALUE=DATE-TIME:20160801T110500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2966@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Lorenz von Smekal (Justus-Liebig University Giessen)
\nWe study the phase diagram of the fermionic Hubbard model on the hexagon
al lattice in the space of on-site and nearest neighbor couplings with Hyb
rid-Monte-Carlo simulations. With pure on-site repulsion this allows to de
termine the critical coupling strength for spin-density wave formation. We
compare the standard approach of introducing a small mass term\, explicit
ly breaking the sublattice symmetry\, with a purely geometric mass\, i.e.
using lattices and boundary conditions such that the Dirac points fall in
between the grid points inside the Brillouin zone without explicit sublatt
ice-symmetry breaking. For the first method we extrapolate the correspondi
ng susceptibility peaks towards zero mass and infinite volume in the usual
way\, while with the geometric mass only infinite volume extrapolation is
needed. An added bonus is that it can be used with nearest neighbor repul
sion and charge-density wave formation where the corresponding mass term w
ould introduce a sign problem. The geometric mass thus provides a promisin
g method to study the competition between these different types of order a
nd the resulting phase diagram with ab-initio simulations.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/530/contributions/2966/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2966/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Confinement/deconfinement phase transition in the $SU(3)$ Yang-Mil
ls theory: center symmetry and Meissner effect
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2967@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Akihiro Shibata (Computing Research Center\, KEK)\n\
nThe dual superconductivity is a promising mechanism for quark confinement
. We have presented a new formulation of the Yang-Mills theory on the lat
tice\, and pointed out that the $SU(3)$ Yang-Mills theory has a new way of
reformulation using new field variables (minimal option)\, in addition to
the conventional option adopted by Cho\, Faddeev and Niemi (maximal optio
n). In the preceding works\, we have accumulated the numerical evidences
that support the non-Abelian dual superconductivity using the minimal opt
ion for the SU(3) Yang-Mills theory. \n\n\n In this talk\, we focus on
the confinement/deconfinement phase transition \nfrom the viewpoint of the
dual superconductivity. The confinement/deconfinement phase transition is
conventionally detected by using center symmetry unbroken/spontaneous br
eaking. In view of the dual superconductivity\, the confinemenet/deconfi
nement phase transition must be described by the phase transition dual Mei
ssner effect at finite temperature. For this purpose\, we measure the dist
ribution of the chromoelectric flux connecting a quark and an antiquark an
d the induced magnetic-monopole current around the flux tube which is the
candidate of the order parameter for the confinement/deconfinement phase
transition. Finally\, we will discuss the relation between center symmetry
and the dual Meissner effect.\n\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/530/contributions/2967/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2967/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization constants of the lattice energy momentum tensor us
ing the gradient flow
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2968@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Capponi (Plymouth University)\nWe present
an update about our program for the non perturbative renormalization of th
e energy momentum tensor. Our strategy is based on probing suitable lattic
e Ward identities with observables computed along the gradient flow. This
set of identities exhibits many interesting qualities\, resulting from the
UV finiteness of flowed composite operators\, and can be used to measure
the renormalization constants of the energy momentum tensor. We apply this
method for a SU(3) Yang-Mills theory on the lattice\, and report our nume
rical results.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contribution
s/2968/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2968/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charm quark diffusion coefficient and relaxation time on the quenc
hed lattice
DTSTART;VALUE=DATE-TIME:20160801T132500Z
DTEND;VALUE=DATE-TIME:20160801T135000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2969@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Atsuro Ikeda (Osaka University)\nWe study the transp
ort coefficient for the charm quark in the deconfined phase from \ncorrela
tor in the temporal channel with nonzero momentum on the quenched lattice.
\nLattice Euclidean correlator in the temporal channel with zero momentum
is constant \nas a function of the imaginary time because of the charge co
nservation.\nHowever\, the derivative of the correlator with respect to mo
mentum contains information for \nthe diffusion coefficient and the relaxa
tion time. We measure the derivative on the lattice and give a constraint
on the charm quark diffusion coefficient and the relaxation time on the la
ttice for 1.5 \n\nhttps://conference.ippp.dur.ac.uk/event/530/contribution
s/2969/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2969/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Infinite dimensional/continuous compressed sensing in physics
DTSTART;VALUE=DATE-TIME:20160802T130000Z
DTEND;VALUE=DATE-TIME:20160802T134500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2970@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Anders Hansen (DAMTP Cambridge)\nCompressed sensing
has had a considerable impact on inverse problems and sampling theory over
the last ten years. However\, the traditional compressed sensing setup an
d theory is usually discrete\, a fact that may seem at odds with many of t
he physical models that are over the continuum. In this talk we will discu
ss how one can design compressed sensing over the continuum and how this a
pproach changes the theory and also the algorithmic setup. There are sever
al advantages that this path may bring. First\, it allows for new types of
applications in physics and potentially improved performance of the recon
struction techniques. Second\, it allows for a better understanding of the
asymptotic phenomena that govern compressed sensing. By understanding the
se phenomena one can taylor compressed sensing to the specific application
s in order to optimise the quality of the reconstructions.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/530/contributions/2970/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2970/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics of two-color matter at non-zero baryon density
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2971@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: pietro giudice (University of Muenster)\nWe study tw
o-color QCD with two flavours of Wilson fermion as a\nfunction of quark ch
emical potential and temperature.\nRecent results are presented and the ph
ase diagram is discussed.\n\nhttps://conference.ippp.dur.ac.uk/event/530/c
ontributions/2971/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2971/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anderson localisation of Dirac eigenmodes in high temperature QCD
DTSTART;VALUE=DATE-TIME:20160801T095500Z
DTEND;VALUE=DATE-TIME:20160801T104000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2972@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Guido Cossu (Higgs Centre for Theoretical Physics\,
School of Physics and Astronomy\, University of Edinburgh)\nWe investigate
the properties of the background gauge field configurations that act as d
isorder for the Anderson localization mechanism in the Dirac spectrum of Q
CD at high temperatures. We compute the eigenmodes of the M\\"obius domain
-wall fermion operator on configurations generated for the $SU(3)$ gauge t
heory with two flavors of fermions\, in the temperature range $[0.9\,1.9]T
_c$. We identify the source of localization of the eigenmodes with gauge c
onfigurations that are self-dual and support negative fluctuations of the
Polyakov loop $P_L$\, in the high temperature sea of $P_L\\sim 1$. The dep
endence of these observations on the boundary conditions of the valence op
erator is studied. We also investigate the spatial overlap of the left-han
ded and right-handed projected eigenmodes in correlation with the localiza
tion and the corresponding eigenvalue. We discuss an interpretation of the
results in terms of monopole-instanton structures.\n\nhttps://conference.
ippp.dur.ac.uk/event/530/contributions/2972/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2972/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Novel chiral structure realized by rotation
DTSTART;VALUE=DATE-TIME:20160801T160000Z
DTEND;VALUE=DATE-TIME:20160801T162500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2973@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kazuya Mameda (The University of Tokyo)\nIn nonrelat
ivistic many-body systems\, rotation produces interesting phenomena as wel
l as external electromagnetic field and finite chemical potential. On the
other hand rotational effects on relativistic systems have not been elucid
ated. Nevertheless it is known that a rapid rotation is realized in main o
bjectives of QCD physics: heavy-ion collisions and neutron stars. In this
talk\, we construct the framework of the QCD in rotating systems. Based on
this\, we investigate the chiral structure under the presence of magnetic
background and rotation. We suggest that the interplay between magnetic f
ield and rotation leads to the “*rotational magnetic inhibition*” that
is a novel phenomenon analogous to the inverse magnetic catalysis.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/530/contributions/2973/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2973/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD energy momentum tensor at finite temperature using gradient fl
ow
DTSTART;VALUE=DATE-TIME:20160801T141500Z
DTEND;VALUE=DATE-TIME:20160801T144000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2974@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yusuke Taniguchi (University of Tsukuba)\nWe apply t
he gradient flow method to Nf=2+1 full QCD at finite temperature.\nOur mai
n interest is on temperature dependence of:\n1. energy-momentum tensor wit
h quark contribution\,\n2. chiral condensate and its susceptibility.\nWe s
how that these observables are well measured with the gradient flow method
.\nOur finite temperature system is constructed by fixing the lattice spac
ing and varying\nthe temporal length Nt (fixed scale method).\nWe adopt th
e lattice spacing a=0.07 (fm) and cover a wide range of temperature region
\n$174\\le T\\le697$ MeV.\nThe ud quark mass is rather heavy$m_{\\pi}/m_{\
\rho}\\simeq0.63$ and s quark mass is\nset to almost the physical value.\n
\nhttps://conference.ippp.dur.ac.uk/event/530/contributions/2974/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2974/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological susceptibility in finite-temperature (2+1)-flavor QCD
with gradient flow
DTSTART;VALUE=DATE-TIME:20160803T111500Z
DTEND;VALUE=DATE-TIME:20160803T114000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2976@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kazuyuki Kanaya (CiRfSE\, Univ. Tsukuba)\nWe study t
he temperature-dependence of the topological susceptibility\, determined i
n (2+1)-flavor QCD with improved Wilson quarks. To calculate the topologic
al charge and its susceptibility\, we adopt the gradient flow method. Wit
h heavy up and down quarks ($m_{\\rm PS}/m_V \\approx 0.63$) and approxima
tely physical strange quark\, we study in the range $T=174-697$ MeV.\n\nht
tps://conference.ippp.dur.ac.uk/event/530/contributions/2976/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2976/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Solving the sign problem by going with the flow
DTSTART;VALUE=DATE-TIME:20160802T105000Z
DTEND;VALUE=DATE-TIME:20160802T111500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2978@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Paulo Bedaque (University of Maryland)\nWe discuss a
n approach to solve the sign problem based on deforming the region of inte
gration in the path integral from real fields to a manifold in complex spa
ce. It generalizes the"Lefschetz thimble" approach that received much atte
ntion lately. We discuss principles through a simple geometrical picture\,
discuss algorithm features required to make the idea work and present exa
mples in simple models ranging from 0+1 D fermionic models to 3+1D bosonic
models and real time dynamics.\n\nhttps://conference.ippp.dur.ac.uk/event
/530/contributions/2978/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2978/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge cooling for the singular-drift problem in the complex Langev
in method
DTSTART;VALUE=DATE-TIME:20160802T141000Z
DTEND;VALUE=DATE-TIME:20160802T143500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2979@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Keitaro Nagata (KEK\, Theory Center)\nRecently\, the
complex Langevin method has been applied successfully to finite density Q
CD either in the deconfinement phase or in the heavy dense limit with the
aid of a new technique called the gauge cooling. In the confinement phase
with light quarks\, however\, convergence to wrong limits occurs due to th
e singularity in the drift term caused by small eigenvalues of the Dirac o
perator including the mass term. We propose that this singular-drift probl
em should also be overcome by the gauge cooling with different criteria fo
r choosing the complexified gauge transformation. \n\nI will explain the i
dea of our method\, what criteria allows us to avoid the singular drift pr
oblem. Applying the method to chiral Random Matrix Theory\, I will show th
at the method indeed works for the chRMT\, where the gauge cooling changes
drastically the eigenvalue distribution of the Dirac operator measured du
ring the Langevin process. This change of the eigenvalue distribution is e
xplained by a generalized Banks-Casher relation. \nI will also present a
result for finite density QCD in the confinement phase. \n\n\nK. Nagata\,
J. Nishimura\, S. Shimasaki\, arXiv:1604.07717\, arXiv:1511.08580.\n\nhttp
s://conference.ippp.dur.ac.uk/event/530/contributions/2979/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2979/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Critical endline of the finite temperature phase transition for 2+
1 flavor QCD around the SU(3)-flavor symmetric point
DTSTART;VALUE=DATE-TIME:20160803T152500Z
DTEND;VALUE=DATE-TIME:20160803T155000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2980@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yoshifumi Nakamura (RIKEN)\nWe investigate the criti
cal endline of the finite temperature phase transition of QCD around the
SU(3)-flavor symmetric point at zero chemical potential.\nWe employ the re
normalization-group improved Iwasaki gauge action and non-perturbatively $
O(a)$-improved Wilson-clover fermion action.\nThe critical endline is det
ermined by using the intersection point of kurtosis\, employing the multi-
parameter\, multi-ensemble reweighting method to calculate observables off
the SU(3)-symmetric point\, at the temporal size $N_{\\rm T}$=6 and latt
ice spacing as low as $a \\approx 0.19$ fm.\nWe confirm that the slope of
the critical endline takes the value of $-2$\, and find that the second
derivative is positive\, at the SU(3)-flavor symmetric point on the Columb
ia plot parametrized with the strange quark mass $m_s$ and degenerated up-
down quark mass $m_{\\rm l}$.\n\nhttps://conference.ippp.dur.ac.uk/event/5
30/contributions/2980/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2980/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mastering the effect of Fermionic Determinant Zeroes in Complex La
ngevin Simulations of Heavy-Dense QCD
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2981@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ion-Olimpiu Stamatescu (I.T.P.\, University Heidelbe
rg)\nZeroes in the fermionic determinant induce poles in the drift\nof the
Langevin equation. We here study their effect on Complex Langevin\nsimula
tions in an effective model related to QCD in the limit of heavy quarks \n
and large chemical potential. The latter was defined long ago by one of th
e authors and \nused thereafter in various contexts. \nWe approach in thi
s way a\nquantitative understanding of the conditions for reliability\nand
define systematic errors for the results which could be extended to\n rea
listic lattice simulations.\n\nhttps://conference.ippp.dur.ac.uk/event/530
/contributions/2981/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2981/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin for Lattice QCD at $T=0$ and $\\mu \\ge 0$.
DTSTART;VALUE=DATE-TIME:20160802T150500Z
DTEND;VALUE=DATE-TIME:20160802T153000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2983@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Donald SInclair (Argonne-Seville)\nWe simulate Latti
ce QCD with 2 light quark flavours at zero temperature and finite quark nu
mber chemical potential $\\mu$. Gauge cooling is applied\, along with adap
tive rescaling of the updating `time' increment\, to stabilize the algorit
hm. We see evidence for the expected transition at $\\mu \\approx m_N/3$ a
nd for saturation at large $\\mu$. Limitations of the method are discussed
.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contributions/2983/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2983/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin Dynamics for a Random Matrix Model of QCD at fini
te density
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2984@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Savvas Zafeiropoulos (Goethe University Frankfurt)\n
We study a Random Matrix Model for QCD at finite density via Complex Lange
vin dynamics. This model has a phase transition to a phase with non-zero b
aryon density. We study the convergence of the algorithm as a function of
the quark mass and the chemical potential and focus on two main observable
s: the baryon density and the chiral condensate. As expected\, for simulat
ions close to the chiral limit\, the algorithm has wrong convergence prope
rties when the quark mass is in the spectral domain of the quenched Dirac
operator. Possible solutions of this problem are discussed.\n\nhttps://co
nference.ippp.dur.ac.uk/event/530/contributions/2984/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2984/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Results on the heavy-dense QCD phase diagram using complex Langevi
n
DTSTART;VALUE=DATE-TIME:20160802T153000Z
DTEND;VALUE=DATE-TIME:20160802T155500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2986@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Felipe Attanasio (Swansea University)\nComplex Lange
vin simulations have been able to successfully reproduce results from Mont
e Carlo methods in the region where the sign problem is mild and make pred
ictions when it is exponentially hard. We present here our study of the QC
D phase diagram in the limit of heavy and dense quarks (HDQCD) for 3 diffe
rent lattice volumes and the boundary between the hadronic phase and the q
uark-gluon plasma. We also discuss instabilities encountered in our simula
tions.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contributions/2986/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2986/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological visualisation techniques to enhance understanding of l
attice QCD simulations
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2989@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Dean Thomas (Swansea University)\nTopology driven te
chniques are an important and established tool in volume visualisation com
puter graphics\; however\, they have yet to see widespread adoption in the
lattice QCD community. In comparison to traditional isosurfacing algorit
hms they offer a number of advantages including faster rendering speeds an
d enhanced data exploration possibilities. The ability to summarise the t
opology of a scalar field is achieved using various graph based data struc
tures and algorithms. In our work we use these techniques to visualise an
d quantify the topological effects experienced in SU(2) lattice gauge theo
ry as chemical potential is varied.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/530/contributions/2989/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2989/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Matter from the lattice
DTSTART;VALUE=DATE-TIME:20160803T130000Z
DTEND;VALUE=DATE-TIME:20160803T134500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2990@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: George Fleming (Yale University)\nhttps://conference
.ippp.dur.ac.uk/event/530/contributions/2990/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2990/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice NRQCD study of thermal Sommerfeld factor
DTSTART;VALUE=DATE-TIME:20160801T153500Z
DTEND;VALUE=DATE-TIME:20160801T160000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2991@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Seyong Kim (Sejong University)\nThe thermal Sommerfe
ld factor\, concerning the co-annihilation rate\nof heavy quarks in therma
l equilibrium\, is shown that it can be\ndefined in terms of two-point cor
relator ratios. Then\, we calculate\nnon-perturbatively the co-annihilatio
n rate of heavy quarks close to\nthermal equilibrium using lattice NRQCD f
ramework. Lattice\nmeasurements indicate a modest suppression in the octet
channel\, in\nreasonable agreement with perturbation theory\, and a large
enhancement\nin the singlet channel\, much above the perturbative predict
ion. The\nadditional enhancement is suggested to originate from bound stat
e\nformation and subsequent decay\, omitted in previous estimates of\nther
mal Sommerfeld factors\, which were meant for use in Boltzmann\nequations
governing single-particle phase space distributions. We show\nhow bound st
ate effects can be included in perturbative\ncomputations. The latter form
alism may find applications also in\nspecific dark matter models.\n\nhttps
://conference.ippp.dur.ac.uk/event/530/contributions/2991/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2991/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bulk properties of strongly interacting matter: recent results fro
m lattice QCD
DTSTART;VALUE=DATE-TIME:20160803T080000Z
DTEND;VALUE=DATE-TIME:20160803T084500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2992@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Claudia Ratti (University of Houston)\nI will review
the most recent results on QCD thermodynamics from lattice simulations. I
n particular\, I will focus on the equation of state at zero and finite ch
emical potential\, the curvature of the QCD phase diagram and fluctuations
of conserved charges. The latter will be discussed in relation with the e
xperimental Beam Energy Scan program at RHIC.\n\nhttps://conference.ippp.d
ur.ac.uk/event/530/contributions/2992/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2992/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent progress of Lefschetz-thimble path integral and refine comp
lex Langevin method
DTSTART;VALUE=DATE-TIME:20160802T100500Z
DTEND;VALUE=DATE-TIME:20160802T105000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2993@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yuya Tanizaki (RIKEN BNL Research Center)\nIf the cl
assical action takes complex values\, the path integral formulation of qua
ntum field theories suffers from the sign problem\, and some artifice beco
mes necessary in order to study their nonperturbative properties. The idea
to complexify field variables is a candidate for such tricks\, and there
are two methods belonging into this category: Lefschetz-thimble path integ
ral and complex Langevin method. In this talk\, I will review recent progr
ess of Lefschetz-thimble path integral with its brief introduction\, and t
ry to reconsider about complex Langevin method from this point of view.\n\
nhttps://conference.ippp.dur.ac.uk/event/530/contributions/2993/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2993/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The smallest of the Little Bangs: thermalization and collective fl
ow in pp and pA collisions (??!)
DTSTART;VALUE=DATE-TIME:20160801T081500Z
DTEND;VALUE=DATE-TIME:20160801T090000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2994@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ulrich Heinz (The Ohio State University)\nRecent exp
erimental data from p+Pb and high-multiplicity p+p collisions at the LHC\,
as well as p+Au\, d+Au and He3+Au collisions at RHIC\, suggest strongly t
hat the same collective phenomena that have been attributed to hydrodynami
c flow in collisions between heavy nuclei also manifest in qualitatively i
dentical ways in collisions where one or both collision partners are as sm
all as a proton. How can this be??! To resolve this surprise\, I will disc
uss the conditions under which hydrodynamic behavior can be expected\, and
show that modern (resummed) versions of viscous fluid dynamics that accou
nt more efficiently for unavoidable strong local momentum anisotropies in
rapidly and strongly anisotropically expanding systems can quite accuratel
y describe the evolution of fireballs whose local phase-space distribution
is far from thermal equilibrium. I will argue that the largest stumbling
block on the way towards a quantitative dynamical understanding of the evo
lution of small collision systems is not a likely breakdown of the hydrody
namic framework\, but our insufficient knowledge of the internal spatial s
tructure of the proton and its quantum fluctuations from collision event t
o event. Some recent suggestions for improved modelling of the initial-sta
te fluctuations in small collision systems will be reported.\n\nhttps://co
nference.ippp.dur.ac.uk/event/530/contributions/2994/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2994/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Electrical conductivity and light vector-meson dissociation across
the deconfinement phase transition in two flavor lattice QCD
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2995@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Anthony Francis (York University)\nWe present result
s on the isovector vector channel spectral functions at vanishing momentum
across the deconfinement phase transition in dynamical $n_f=2$ lattice QC
D. Using Wilson-Clover fermions the calculations are carried out with a va
cuum pion mass of $\\simeq 270$MeV at the temperatures $T/T_c=0.156\, 0.8\
, 1.0\, 1.25$ and 1.67. The spectral functions are reconstructed from loca
l-conserved vector correlation functions by fitting a phenomenologically m
otivated Ansatz and enforcing exact sum rules to the data. We show results
for the electrical conductivity across the deconfinement phase transition
and find evidence for the dissociation of the $\\rho$-meson. In addition
we apply the Backus-Gilbert method to our data and compare kinetic theory
predictions and previously published phenomenological spectral functions t
o our lattice study.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contri
butions/2995/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2995/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Temperature dependence of shear viscosity in SU(3)-gluodynamics
DTSTART;VALUE=DATE-TIME:20160801T135000Z
DTEND;VALUE=DATE-TIME:20160801T141500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2996@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Victor Braguta (ITEP)\nThis report is devoted to the
study of temperature dependence of shear viscosity in SU(3)-gluodynamics.
\nTo calculate shear viscosity we measured the correlation function of th
e energy-momentum tensor\nT_{12}T_{12} for a set of temperatures in the re
gion T/T_c \\in (0.9\, 1.5). The measurements \nwere carried out using mu
ltilevel algorithm which considerably improves the accuracy \nof the data.
The results of the calculation allow to determine temperature dependence
of \nthe ratio of shear viscosity to the entropy density {\\eta}/s.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/530/contributions/2996/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2996/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stochastic Quantization with Colored Noise
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2997@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Felix Ziegler (Heidelberg University)\nStudying the
topological properties of the QCD vacuum on the lattice\, observables such
as the gauge action density are blurred by short distance fluctuations at
scales of the order of the lattice spacing.\nTo extract the physical cont
ent from the mentioned configurations\, those have to be treated using smo
othing methods such as cooling or the Wilson flow which have been investig
ated extensively over the past years. \nWe present an alternative method b
ased on stochastic quantization with UV regulated noise enabling a direct
control of the quantum fluctuations at all lattice momentum scales. Our pa
rticular interest is to investigate the correspondence between the flow ti
me and the associated physical scale of the system. Thereto observables de
pending on the long-range physics such as topological quantities are inves
tigated.\nThe method is tested on a real scalar field theory as well as on
pure SU(2) gauge theory. Effects of colored noise\non observables are ana
lyzed. Moreover\, we investigate whether physical quantities become insens
itive to UV fluctuations above a characteristic momentum scale.\nThe suita
bility and efficiency of the method regarding the generation of smoothed f
ields in a Monte Carlo simulation is probed. We present and discuss our re
cent results.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contributions
/2997/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2997/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The density of states method applied to the Ising model with an im
aginary magnetic field
DTSTART;VALUE=DATE-TIME:20160802T084500Z
DTEND;VALUE=DATE-TIME:20160802T091000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2998@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Philippe de Forcrand (ETH Zurich &\; CERN)\nAbove
the Curie temperature\, the Ising model partition function can\nvanish un
der the effect of an imaginary magnetic field\, as first\nshown by Lee and
Yang. This system has a severe sign problem.\nWe study it numerically\, u
sing the density of states method.\nIn particular\, we consider how the co
mputer effort scales with\nthe system size.\n\nhttps://conference.ippp.dur
.ac.uk/event/530/contributions/2998/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2998/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryons across the deconfinement transition
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-2999@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Gert Aarts (Swansea University)\nUnlike mesons\, lat
tice studies of baryons at finite temperature are very\nlimited. We presen
t results for baryon correlators and spectral functions\nacross the deconf
inement transition\, using the FASTSUM 2+1 flavour\nensembles as well as r
esults with free lattice fermions.\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/530/contributions/2999/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/2999/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A G(2)-QCD Neutron Star
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3000@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ouraman Hajizadeh (University of Graz)\nG2-QCD\, i.e
. QCD with the gauge group SU(3) replaced by the exceptional\ngroup G(2)\,
shares many features with SU(3). But it is accessible at\nfinite density
on the lattice\, as it has no sign problem\, and at the\nsame time has a n
eutron.\n\nTherefore\, this theory can sustain in princple neutron star. U
sing the\nequation of state for this theory from lattice simulations\, we
solve the\nOppenheimer-Volkoff equation and obtain the mass-radius-relatio
n of such\nneutron stars.\n\nThis study shows how different phases\, visib
le in the equation of state\,\ninfluence the mass-radius relation\, and th
erefore gives guidance for the\ncase of full QCD and true neutron stars.\n
\nhttps://conference.ippp.dur.ac.uk/event/530/contributions/3000/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3000/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale-invariance of three-dimensional QED
DTSTART;VALUE=DATE-TIME:20160801T110500Z
DTEND;VALUE=DATE-TIME:20160801T113000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3002@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nikhil Karthik (Florida International University)\nW
e present results from our lattice simulation of parity-invariant\nthree-d
imensional QED with two dynamical flavors of massless\ntwo-component fermi
ons\, implemented using the overlap operator.\nContradictory to the expect
ation from various plausibility arguments\,\nwe find evidences from the fi
nite-size scaling of eigenvalues of the\nDirac operator and from correlat
ors of fermion bilinears\, for the\ntwo flavor theory to be scale-invarian
t with the mass anomalous\ndimension close to 1\, the maximum allowed valu
e for a conformal\nfield theory.\n\nhttps://conference.ippp.dur.ac.uk/even
t/530/contributions/3002/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3002/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the phase diagram from analytical continuation
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3004@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Szabolcs Borsanyi (University of Wuppertal)\nWe calc
ulate the QCD cross-over temperature\, the equation of state and fluctuati
ons of conserved charges at finite density by analytical continuation from
imaginary to real chemical potentials. Our calculations are based on new
continuum extrapolated lattice simulations using the 4stout staggered acti
ons with a lattice resolution up to Nt=16. The simulation parameters are t
uned such that the strangeness neutrality is maintained\, as it is in heav
y ion collisions.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contribut
ions/3004/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3004/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice results for SU(2) dark matter
DTSTART;VALUE=DATE-TIME:20160803T134500Z
DTEND;VALUE=DATE-TIME:20160803T141000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3005@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jarno Rantaharju (CP3-Origins)\nWe present lattice i
nvestigations of the SU(2) gauge theory with two fermions in the fundament
al representation. This model provides a minimal template which is ideal f
or a wide class of Standard Model extensions featuring novel strong dynami
cs that range from composite (Goldstone) Higgs theories to several intrigu
ing types of dark matter candidates. In the light of these results\, we di
scuss models of SIMP-\, symmetric- and asymmetric dark matter. We estimate
the interaction of the dark matter candidate with Standard Model particle
s through it’s electric polarisability and discuss experimental constrai
nts on these models.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contri
butions/3005/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3005/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theta dependence in the deconfined phase of QCD
DTSTART;VALUE=DATE-TIME:20160803T091000Z
DTEND;VALUE=DATE-TIME:20160803T093500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3006@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Claudio Bonati (Università di Pisa)\nWe will presen
t a determination of the topological properties of QCD for temperatures up
to around 600MeV\, obtained by using Lattice QCD simulations with 2+1 fla
vours of fermions at the physical point. Numerical results will be compar
ed with the predictions of instanton gas calculations and the implications
of these results for the cosmological bounds on the axion mass will be di
scussed.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contributions/3006
/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3006/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The $U_A(1)$ breaking in the chiral limit of two-flavour QCD
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3007@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bastian Brandt (University of Frankfurt)\nWe study t
he strength of the anomalous breaking of the $U_A(1)$ symmetry in the chir
al limit of two-flavour QCD at the transition temperature using the differ
ence of the pseudoscalar and scalar iso-vector screening masses. To this e
nd we use simulations with non-perturbatively $O(a)$-improved Wilson fermi
ons for three different pion masses in the range of 200-550MeV on lattices
with a temporal extent of 16 and volumes of $32^3$ to $64^3$. We compare
our results to the strong breaking at zero temperature and find that the e
ffect of the breaking in the mass difference is reduced by at least a fact
or of five. This indicates a weak $U_A(1)$ breaking at the transition temp
erature and raises the question of its influence on the nature of the chir
al transition. It is generally expected that a weaker breaking strenghtens
the chiral phase transition.\n\nhttps://conference.ippp.dur.ac.uk/event/5
30/contributions/3007/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3007/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Testing dynamic stabilization in complex Langevin simulations
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3008@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Benjamin Jaeger (Swansea University)\nComplex Langev
in methods have been successfully applied in theories that suffer from a s
ign problem such as HDQCD. We present and illustrate a novel method that e
nsures that Complex Langevin simulations stay close to the SU(3) manifold\
, which lead to correct and improved results in the framework of HDQCD and
pure gauge simulations. Applying the same technique in fully dynamical QC
D simulations shows great potential to allow the determination of the phas
e diagram from first principles.\n\nhttps://conference.ippp.dur.ac.uk/even
t/530/contributions/3008/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3008/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Collisions in Non-conformal Theories: Hydrodynamization without Eq
uilibration
DTSTART;VALUE=DATE-TIME:20160801T151000Z
DTEND;VALUE=DATE-TIME:20160801T153500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3009@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jorge Casalderrey Solana (University of Oxford)\nWe
numerically simulate gravitational shock wave collisions in a holographic
model dual to a non-conformal four-dimensional gauge theory. We find two n
ovel effects associated to the non-zero bulk viscosity of the resulting pl
asma. First\, the hydrodynamization time increases. Second\, if the bulk v
iscosity is large enough then the plasma becomes well described by hydrody
namics before the equilibrium equation of state becomes applicable. We dis
cuss implications for the quark-gluon plasma created in heavy ion collisio
n experiments.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contribution
s/3009/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3009/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A density of state approach to the sign problem
DTSTART;VALUE=DATE-TIME:20160802T080000Z
DTEND;VALUE=DATE-TIME:20160802T084500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3010@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Biagio Lucini (Swansea University)\nMost of the succ
esses of lattice QCD are strictly connected with advances in numerical met
hods. In particular\, importance sampling Monte Carlo methods have underpi
nned lattice QCD calculations since the early days of the field. However\,
it is well known that importance sampling methods fail in cases when one
has to sample over configurations whose occurrence is suppressed by the Mo
nte Carlo measure. Typical examples are first order phase transitions\, in
which two equally probable equilibrium states are connected by configurat
ions with probability of occurrence exponentially suppressed with the syst
em size\, or the sign problem\, whereby strong cancellations occurring for
observables evaluated over highly probable configurations give a high rel
ative weight to less recurring states. A possible way around these problem
s is a direct sampling of the density of states through a non-Markovian Ra
ndom Walk in configuration space\, as proposed by Wang and Landau a few ye
ars ago. In this contribution\, I review the Logarithmic Linear Relaxation
(LLR) method\, a recently introduced algorithm in the Wang-Landau class t
hat allows us to determine density of states over several orders of magnit
ude with the same relative accuracy. After an introduction to the ideas in
spiring the algorithm and the presentation of some practical implementatio
ns\, I discuss some applications to spin and gauge systems\, with emphasis
on the sign problem and the challenges it presents.\n\nhttps://conference
.ippp.dur.ac.uk/event/530/contributions/3010/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3010/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Critical Phenomena in 8-Flavour QCD
DTSTART;VALUE=DATE-TIME:20160803T150000Z
DTEND;VALUE=DATE-TIME:20160803T152500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3011@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kohtaroh Miura (Centre de Physique Theorique\, Aix-M
arseille Universite)\nNovel (quasi-)conformal dynamics associated with Inf
ra-red fixed point is anticipated to emerge in many-flavor QCD\, and advoc
ated as a basis for strongly-interacting mechanisms of electroweak symmetr
y breaking. The subject is closely related to the critical phenomena of ch
iral phase transition in usual (3-flavour) QCD. In this regard\, we show t
he latest lattice simulation (LatKMI) results for the scaling property of
8-flavor QCD. Also\, motivated by the Baryogenesis\, we discuss thermodyna
mic properties of 8-flavour QCD.\n\nhttps://conference.ippp.dur.ac.uk/even
t/530/contributions/3011/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3011/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$\\theta$-dependence of the massive Schwinger model
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3012@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Eduardo Royo (Universidad de Zaragoza)\nUnderstandin
g the role of the $\\theta$ parameter in QCD and its\nconnection with the
strong CP problem and axion physics is one of the\nmajor challenges for hi
gh energy theorists. Due to the sign problem\,\nat present only the QCD to
pological susceptibility is well\nknown. Using an algorithmic approach tha
t could potentially be\nextended to QCD\, we study as a first step the $\\
theta$-dependence in\nthe massive Schwinger model\, and try to verify a co
njecture of\nColeman.\n\nhttps://conference.ippp.dur.ac.uk/event/530/contr
ibutions/3012/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3012/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the phase diagram of dense two-color QCD with $N_f=2$ wit
hin lattice simulation
DTSTART;VALUE=DATE-TIME:20160803T155000Z
DTEND;VALUE=DATE-TIME:20160803T161500Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3013@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Aleksandr Nikolaev (ITEP)\nIn this talk we present o
ur results on the low-temperature scan of the phase diagram of dense two-c
olor QCD with two flavors of quarks. The study is conducted using lattice
simulation with rooted staggered quarks and real baryon chemical potential
. At small chemical potential we observe the hadronic phase\, where the th
eory is in a confining state\, chiral symmetry is broken\, the baryon dens
ity is zero and there is no diquark condensate. At the critical point $\\m
u = m_{\\pi}/2$ we observe the expected second order transition to Bose-Ei
nstein condensation of scalar diquarks. In this phase the system is still
in confinement in conjunction with non-zero baryon density\, but the chira
l symmetry is restored in the chiral limit. We have also found that in the
first two phases the system is well described by chiral perturbation theo
ry. For larger values of the chemical potential the system turns into anot
her phase\, where the relevant degrees of freedom are fermions residing in
side the Fermi sphere\, and the diquark condensation takes place on the Fe
rmi surface. In this phase the system is still in confinement\, chiral sym
metry is restored and the system is very similar to the quarkyonic state p
redicted by SU($N_c$) theory at large $N_c$.\n\nhttps://conference.ippp.du
r.ac.uk/event/530/contributions/3013/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3013/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Block Solver for multiple right hand sides on NVIDIA GPUs
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20210420T003925Z
UID:indico-contribution-530-3014@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Mathias Wagner (NVIDIA)\nAnalysis tasks in Lattice Q
CD thermodynamics often requires solving linear equations for multiple rig
ht hand sides for a constant gauge field. Recently deflation methods have
become more widely used and proven to be very efficient. They however do r
equire the calculation and storing of eigenvectors which is either not alw
ays feasible or suffer from high setup costs. We present results for an im
plementation of a block solver for multiple right hand sides using the QUD
A library for QCD on NVIDIA GPUs. By making use of the gauge field reuse i
n the Dslash operator\, mixed precision approaches and block Krylov space
methods they do provide outstanding solver performance. We present results
on NVIDIA's most recent Pascal architecture. Furthermore we provide an up
date on the QUDA library and overview of NVIDIA's Pascal architecture.\n\n
https://conference.ippp.dur.ac.uk/event/530/contributions/3014/
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/contributions/3014/
END:VEVENT
END:VCALENDAR