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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:20170823T133853Z
UID:indico-contribution-530-28@cern.ch
DESCRIPTION:Speakers: Dr. DI RENZO\, Francesco (University of Parma and IN
FN)\nIn the context of the chiral random matrix model we introduced a way
to compute lattice quantum field theories on Lefschetz thimbles by taking
into account the contributions to the functional integral which come from
complete flow lines. The latter are the steepest ascent paths attached to
critical points\, i.e. the basic building blocks of thimbles. While the th
imble regularization was successfull in solving the chiral random matrix m
odel\, the simulating algorithm we first made use of was the roughest one
could devise\, i.e. static\, crude Monte Carlo. The static\, crude Monte C
arlo was also useful in solving QCD in 0+1 dimensions at finite chemical p
otential\, 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 gaus
sian approximation of the thimble: this defines the proposals for a Metrop
olis-like accept/reject step. We present this new algorithm\, showing its
effectiveness in the case of the chiral random matrix model and discussing
applications to other theories. In particular\, we are going to address t
he issues and the formalism for thimble regularization of Yang Mills theor
y in 2 dimensions with complex coupling.\n\nhttps://conference.ippp.dur.ac
.uk/event/530/session/3/contribution/28
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/3/contribution/28
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:20170823T133853Z
UID:indico-contribution-530-29@cern.ch
DESCRIPTION:Speakers: Dr. FRISON\, Julien (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 becom
es practically impossible for lattice QCD to handle volumes large enough t
o allow non-trivial topology and a precise sampling of the sectors involve
d in the $\\theta=0$ vacuum. We present a new method applicable to the com
putation of the decrease of the susceptibility on a wide range of situatio
ns\, including in particular finite-temperature ensembles with $\\chi_t\\l
l 1/V$. This method distinguishes itself from most other methods by not re
lying on the $\\theta=0$ vacuum\, nor any semi-classical approximation aro
und $\\theta=0$\, but only on topology-fixed configurations. We will provi
de some encouraging preliminary results on quenched ensembles\, and discus
s the generalisation to any simulation.\n\nhttps://conference.ippp.dur.ac.
uk/event/530/session/1/contribution/29
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/29
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:20170823T133853Z
UID:indico-contribution-530-60@cern.ch
DESCRIPTION:Speakers: Mr. LI\, Sheng-Tai (Central China Normal University)
\nWe present our recent results on the chiral phase transition in 2+1 flav
or QCD on lattices with temporal extent $N_{\\tau} = 6$. We have performed
lattice QCD simulations using the Highly Improved Staggered Quarks with 5
different values of pion masses\, i.e. 160\, 140\, 110\, 90\, 80 MeV in a
temperature window from 140 MeV to 170 MeV. We have analyzed the universa
l scaling behaviour of the chiral phase transition at vanishing baryon che
mical potential by looking into the temperature and quark mass dependences
of the chiral condensates of chiral susceptibilities. The window of criti
cality compared to previous studies is also discussed.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/530/session/1/contribution/60
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/60
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:20170823T133853Z
UID:indico-contribution-530-61@cern.ch
DESCRIPTION:Speakers: Dr. LEE\, Jong-Wan (Swansea University)\nRecently th
e two-color gauge theory with two flavors of fundamental fermions has rece
ived considerable attention in BSM model building\, as it provides a minim
al template for a composite Higgs theory that includes dark matter candida
tes. In this work\, we consider the two-color model with two flavors of Wi
lson fermions at non-zero temperature. For a more reliable investigation o
f meson correlation functions at high temperature\, we perform simulations
on anisotropic lattices with a target anisotropic factor of a_s/a_t=6.3.
The tuning of bare parameters was carried out using the pseudo-scalar disp
ersion relation and Wilson loop ratios. We present our preliminary results
for the identification of parity doubling from the temporal and spacial c
orrelation functions of vector and axial-vector mesons.\n\nhttps://confere
nce.ippp.dur.ac.uk/event/530/session/7/contribution/61
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/7/contribution/61
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:20170823T133853Z
UID:indico-contribution-530-62@cern.ch
DESCRIPTION:Speakers: Mr. RINDLISBACHER\, Tobias (ETH Zürich)\nWe recentl
y proposed a new type of worm algorithm for simulating the CP(N-1) model a
t finite density in a dual representation based on flux-variables. Here we
continue by discussing how a topological term can be incorporated into ou
r dual formulation.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session
/1/contribution/62
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/62
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QED with dual variables
DTSTART;VALUE=DATE-TIME:20160802T091000Z
DTEND;VALUE=DATE-TIME:20160802T093500Z
DTSTAMP;VALUE=DATE-TIME:20170823T133853Z
UID:indico-contribution-530-63@cern.ch
DESCRIPTION:Speakers: VAIRINHOS\, Helvio (ETH Zurich)\nWith the help of au
xiliary fields\, it is possible to integrate out analytically the link var
iables in lattice gauge theory with staggered fermions\, for arbitrary val
ues of the lattice coupling. In the case of N_f=1 QED\, the subsequent Gra
ssmann integration yields a dual representation of the partition function\
, which traces over an ensemble of monomers\, dimers\, and electron loops
coupled to the auxiliary fields. We simulate this system using diagrammati
c Monte Carlo methods\, and explore the residual sign problem which surviv
es after all the analytical integrations.\n\nhttps://conference.ippp.dur.a
c.uk/event/530/session/3/contribution/63
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/3/contribution/63
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:20170823T133853Z
UID:indico-contribution-530-64@cern.ch
DESCRIPTION:Speakers: Dr. MONNAI\, Akihiko (Institut de Physique Théoriqu
e\, CNRS/CEA)\nThe properties of a QCD medium at finite density is extensi
vely studied in the recent beam energy scan program at BNL Relativistic He
avy Ion collider. One of the main goals of the program is to understand th
e QCD phase structure and to verify the existence of a critical point. A d
ifficulty in such analyses is that a signal of the critical point could be
thermally washed away if its location is far from the freeze-out\, unless
its effects on dynamical evolution is sizable enough to modify the freeze
-out hypersurface.\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 estimate thermal photon spectra and flow harmonics. Since the medium
is electromagnetically transparent\, there is an advantage that the critic
al point does not have to be near the freeze-out for its photonic signal t
o be detectable. We present the results from (2+1)-dimensional hydrodynami
c simulation and discuss their phenomenological consequences.\n\nhttps://c
onference.ippp.dur.ac.uk/event/530/session/0/contribution/64
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/0/contribution/64
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:20170823T133853Z
UID:indico-contribution-530-65@cern.ch
DESCRIPTION:Speakers: Dr. KACZMAREK\, Olaf (University of Bielefeld)\nWe e
stimate the photon production rate from an SU(3) plasma at\ntemperatures o
f about $1.1~T_c$ and $1.3~T_c$. Lattice results for the\nvector current c
orrelator at spatial momenta $k\\sim (2-6)T$ are\nextrapolated to the cont
inuum limit and analyzed with the help of a\npolynomial interpolation for
the corresponding spectral function\,\nwhich vanishes at zero frequency an
d matches to high-precision\nperturbative results at large invariant masse
s. For small invariant\nmasses the interpolation is compared with the NLO
weak-coupling\nresult\, hydrodynamics\, and a holographic model. At vanish
ing invariant\nmass we extract the photon rate which for $k \\sim 3T$ is f
ound to be\nclose to the NLO weak-coupling prediction. For $k \\sim 2T$\nu
ncertainties remain large but the photon rate is likely to fall below\nthe
NLO prediction\, in accordance with the onset of a strongly\ninteracting
behaviour characteristic of the hydrodynamic regime.\n\nhttps://conference
.ippp.dur.ac.uk/event/530/session/2/contribution/65
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/2/contribution/65
END:VEVENT
BEGIN:VEVENT
SUMMARY:Confinement and Magnetic Fields
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20170823T133853Z
UID:indico-contribution-530-66@cern.ch
DESCRIPTION:Speakers: Mr. SANFILIPPO\, Francesco (University of Southampto
n)\nOne of the greatest achievement of lattice QCD is the numerical determ
ination of the confinement potential between pairs of static quarks\, as w
ell as the measurement of the shape of the color-flux tube connecting them
. In this talk I will present how this is modified in the presence of a ma
gnetic field.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/1/con
tribution/66
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/66
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:20170823T133853Z
UID:indico-contribution-530-67@cern.ch
DESCRIPTION:Speakers: Dr. DATTA\, Saumen (Tata Institute of Fundamental Re
search)\nThe deconfinement transition is typically studied using the Polya
kov loop\,\nwhich needs renormalization. We look at the renormalization of
Polyakov loop\nusing Wilson flow\, for both quenched and $N_f=2$ QCD. We
also investigate \nsome observables related to the Polyakov loop that has
been suggested\, and \nthe behavior of the gluon condensate across the tr
ansition.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/1/contrib
ution/67
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/67
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening
DTSTART;VALUE=DATE-TIME:20160801T080000Z
DTEND;VALUE=DATE-TIME:20160801T081500Z
DTSTAMP;VALUE=DATE-TIME:20170823T133853Z
UID:indico-contribution-530-69@cern.ch
DESCRIPTION:Speakers: Prof. LANGFELD\, Kurt (Plymouth University)\nhttps:/
/conference.ippp.dur.ac.uk/event/530/session/0/contribution/69
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/0/contribution/69
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:20170823T133853Z
UID:indico-contribution-530-52@cern.ch
DESCRIPTION:Speakers: Dr. SCHMIDT\, Christian (Universitaet Bielefeld)\nWe
present results from a calculation of the QCD equation of state up\nto th
e sixth order in the baryon number\, strangeness and electric charge\nchem
ical potentials. We consider various cases to express strangeness\nand ele
ctric charge chemical potentials as function of the baryon\nchemical poten
tial and temperature. Among those\, the conditions met in\nheavy ion colli
sion are best reproduced by enforcing strangeness\nneutrality and a consta
nt baryon number to electric charge ratio. We\nwill further discuss how cu
mulant rations of conserved charge\nfluctuations that are available in bot
h\, lattice QCD simulations and\nheavy ion experiments\, can be used to de
termine freeze-out parameters\nincluding the freeze-out curvature of the e
xperiment.\n\nThe presented results are based on lattice calculations perf
ormed with\nthe Highly Improved Staggered Quark action (HISQ) in the tempe
rature\nrange 140 MeV \n\nhttps://conference.ippp.dur.ac.uk/event/530/sess
ion/6/contribution/52
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/6/contribution/52
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:20170823T133853Z
UID:indico-contribution-530-24@cern.ch
DESCRIPTION:Speakers: Dr. BRANDT\, Bastian (University of Frankfurt)\nWe i
nvestigate the phase diagram of QCD at finite isospin chemical potential u
sing 2+1 flavours of staggered fermions with physical quark masses at diff
erent lattice spacings and volumes. For high chemical potentials and low t
emperatures the confined phase shows a transition to the pion condensation
phase. This phase is characterised by a proliferation of low modes that s
low down the simulation considerably and necessitate the use of an infrare
d regulator. We discuss a novel strategy to determine the pion condensate
in the limit of vanishing regulators. To investigate the convergence prope
rties 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
chemical potential at 4 derivative order. This can serve as an important c
rosscheck for the Taylor expansion method at finite baryon chemical potent
ial\, where direct simulations are impossible due to the sign problem.\n\n
https://conference.ippp.dur.ac.uk/event/530/session/6/contribution/24
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/6/contribution/24
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:20170823T133853Z
UID:indico-contribution-530-26@cern.ch
DESCRIPTION:Speakers: Dr. NISHIMURA\, Hiromichi (RIKEN BNL Research Center
)\nWe consider the spectrum of transfer matrix eigenvalues associated with
Polyakov loops in lattice QCD at strong coupling. The transfer matrix at
finite density is non-Hermitian\, and its eigenvalues become complex as a
manifestation of the sign problem. We show that the global symmetries of
finite-density QCD ensure that the complex eigenvalues are part of a comp
lex conjugate pair\, and they lead to sinusoidally modulated decay in Poly
akov loop correlation functions. We argue that the results reflect oscill
atory behavior in color-charge densities reminiscent of density-density co
rrelation functions in liquids\, and it is generic in spin models for QCD
at finite density\, as well as phenomenological models using complex saddl
e points.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/4/contrib
ution/26
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/4/contribution/26
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:20170823T133853Z
UID:indico-contribution-530-27@cern.ch
DESCRIPTION:Speakers: Mr. SHU\, Haitao (CCNU)\nWe present our most updated
results on the charmonium correlation and spectral functions. The correla
tion functions are obtained using the clover improved Wilson fermions on q
uenched lattices with spatial size fixed to 192. And temporal sizes of the
se lattices are chosen to be 96\, 64\, 56\, 48 and 32 corresponding to 0.7
3\, 1.1\, 1.25\, 1.5 and 2.2 Tc. We perform a detailed analysis of these c
harmonium correlators using two different stochastic approaches\, namely S
tochastic Analytical Inference (SAI) and Stochastic Optimization Method (S
OM) to extract the spectral functions. The systematic uncertainties in spe
ctral functions obtained from SOM and SAI will be discussed\, and the comp
arisons with those from Maximum Entropy Method (MEM) also will be presente
d.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/1/contribution/2
7
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/27
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite temperature lattice QCD review
DTSTART;VALUE=DATE-TIME:20160803T100500Z
DTEND;VALUE=DATE-TIME:20160803T105000Z
DTSTAMP;VALUE=DATE-TIME:20170823T133853Z
UID:indico-contribution-530-20@cern.ch
DESCRIPTION:Speakers: NOGRADI\, Daniel (Eotvos University)\nI will review
recent numerical results as well as new ideas and approaches to finite tem
perature lattice QCD at zero chemical potential.\n\nhttps://conference.ipp
p.dur.ac.uk/event/530/session/6/contribution/20
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/6/contribution/20
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:20170823T133853Z
UID:indico-contribution-530-21@cern.ch
DESCRIPTION:Speakers: Prof. VON SMEKAL\, Lorenz (Justus-Liebig University
Giessen)\nWe study the phase diagram of the fermionic Hubbard model on the
hexagonal lattice in the space of on-site and nearest neighbor couplings
with Hybrid-Monte-Carlo simulations. With pure on-site repulsion this allo
ws to determine the critical coupling strength for spin-density wave forma
tion. We compare the standard approach of introducing a small mass term\,
explicitly 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
sublattice-symmetry breaking. For the first method we extrapolate the cor
responding susceptibility peaks towards zero mass and infinite volume in t
he usual way\, while with the geometric mass only infinite volume extrapol
ation is needed. An added bonus is that it can be used with nearest neighb
or repulsion and charge-density wave formation where the corresponding mas
s term would introduce a sign problem. The geometric mass thus provides a
promising method to study the competition between these different types of
order and the resulting phase diagram with ab-initio simulations.\n\nhttp
s://conference.ippp.dur.ac.uk/event/530/session/0/contribution/21
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/0/contribution/21
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:20170823T133853Z
UID:indico-contribution-530-22@cern.ch
DESCRIPTION:Speakers: SHIBATA\, Akihiro (Computing Research Center\, KEK)\
n\nThe dual superconductivity is a promising mechanism for quark confineme
nt. We have presented a new formulation of the Yang-Mills theory on the l
attice\, 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 opt
ion). In the preceding works\, we have accumulated the numerical evidence
s that support the non-Abelian dual superconductivity using the minimal o
ption for the SU(3) Yang-Mills theory. \n\n\n In this talk\, we focus o
n the confinement/deconfinement phase transition \nfrom the viewpoint of t
he dual superconductivity. The confinement/deconfinement phase transition
is conventionally detected by using center symmetry unbroken/spontaneous
breaking. In view of the dual superconductivity\, the confinemenet/decon
finement phase transition must be described by the phase transition dual M
eissner effect at finite temperature. For this purpose\, we measure the di
stribution of the chromoelectric flux connecting a quark and an antiquark
and the induced magnetic-monopole current around the flux tube which is t
he candidate of the order parameter for the confinement/deconfinement phas
e transition. Finally\, we will discuss the relation between center symmet
ry and the dual Meissner effect.\n\n\nhttps://conference.ippp.dur.ac.uk/
event/530/session/1/contribution/22
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/22
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:20170823T133853Z
UID:indico-contribution-530-23@cern.ch
DESCRIPTION:Speakers: Mr. CAPPONI\, Francesco (Plymouth University)\nWe pr
esent an update about our program for the non perturbative renormalization
of the energy momentum tensor. Our strategy is based on probing suitable
lattice Ward identities with observables computed along the gradient flow.
This set of identities exhibits many interesting qualities\, resulting fr
om the UV finiteness of flowed composite operators\, and can be used to me
asure the renormalization constants of the energy momentum tensor. We appl
y this method for a SU(3) Yang-Mills theory on the lattice\, and report ou
r numerical results.\n\nhttps://conference.ippp.dur.ac.uk/event/530/sessio
n/1/contribution/23
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/23
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:20170823T133853Z
UID:indico-contribution-530-46@cern.ch
DESCRIPTION:Speakers: Mr. IKEDA\, Atsuro (Osaka University)\nWe study the
transport coefficient for the charm quark in the deconfined phase from \nc
orrelator in the temporal channel with nonzero momentum on the quenched la
ttice.\nLattice Euclidean correlator in the temporal channel with zero mom
entum is constant \nas a function of the imaginary time because of the cha
rge conservation.\nHowever\, the derivative of the correlator with respect
to momentum contains information for \nthe diffusion coefficient and the
relaxation time. We measure the derivative on the lattice and give a const
raint on the charm quark diffusion coefficient and the relaxation time on
the lattice for 1.5 \n\nhttps://conference.ippp.dur.ac.uk/event/530/sessio
n/2/contribution/46
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/2/contribution/46
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:20170823T133853Z
UID:indico-contribution-530-47@cern.ch
DESCRIPTION:Speakers: Dr. HANSEN\, Anders (DAMTP Cambridge)\nCompressed se
nsing has had a considerable impact on inverse problems and sampling theor
y over the last ten years. However\, the traditional compressed sensing se
tup and theory is usually discrete\, a fact that may seem at odds with man
y of the physical models that are over the continuum. In this talk we will
discuss how one can design compressed sensing over the continuum and how
this approach changes the theory and also the algorithmic setup. There are
several advantages that this path may bring. First\, it allows for new ty
pes of applications in physics and potentially improved performance of the
reconstruction techniques. Second\, it allows for a better understanding
of the asymptotic phenomena that govern compressed sensing. By understandi
ng these phenomena one can taylor compressed sensing to the specific appli
cations in order to optimise the quality of the reconstructions.\n\nhttps:
//conference.ippp.dur.ac.uk/event/530/session/4/contribution/47
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/4/contribution/47
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:20170823T133853Z
UID:indico-contribution-530-44@cern.ch
DESCRIPTION:Speakers: Dr. GIUDICE\, pietro (University of Muenster)\nWe st
udy two-color QCD with two flavours of Wilson fermion as a\nfunction of qu
ark chemical potential and temperature.\nRecent results are presented and
the phase diagram is discussed.\n\nhttps://conference.ippp.dur.ac.uk/event
/530/session/1/contribution/44
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/44
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:20170823T133853Z
UID:indico-contribution-530-45@cern.ch
DESCRIPTION:Speakers: Dr. COSSU\, Guido (Higgs Centre for Theoretical Phys
ics\, School of Physics and Astronomy\, University of Edinburgh)\nWe inves
tigate the properties of the background gauge field configurations that ac
t as disorder for the Anderson localization mechanism in the Dirac spectru
m of QCD at high temperatures. We compute the eigenmodes of the M\\"obius
domain-wall fermion operator on configurations generated for the $SU(3)$ g
auge theory 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 g
auge configurations that are self-dual and support negative fluctuations o
f the Polyakov loop $P_L$\, in the high temperature sea of $P_L\\sim 1$. T
he dependence of these observations on the boundary conditions of the vale
nce operator is studied. We also investigate the spatial overlap of the le
ft-handed and right-handed projected eigenmodes in correlation with the lo
calization and the corresponding eigenvalue. We discuss an interpretation
of the results in terms of monopole-instanton structures.\n\nhttps://confe
rence.ippp.dur.ac.uk/event/530/session/0/contribution/45
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/0/contribution/45
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:20170823T133853Z
UID:indico-contribution-530-42@cern.ch
DESCRIPTION:Speakers: Mr. MAMEDA\, Kazuya (The University of Tokyo)\nIn no
nrelativistic many-body systems\, rotation produces interesting phenomena
as well as external electromagnetic field and finite chemical potential. O
n the other hand rotational effects on relativistic systems have not been
elucidated. Nevertheless it is known that a rapid rotation is realized in
main objectives of QCD physics: heavy-ion collisions and neutron stars. In
this talk\, we construct the framework of the QCD in rotating systems. Ba
sed on this\, we investigate the chiral structure under the presence of ma
gnetic background and rotation. We suggest that the interplay between magn
etic field and rotation leads to the “*rotational magnetic inhibition*
” that is a novel phenomenon analogous to the inverse magnetic catalysis
.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/2/contribution/42
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/2/contribution/42
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:20170823T133853Z
UID:indico-contribution-530-43@cern.ch
DESCRIPTION:Speakers: Dr. TANIGUCHI\, Yusuke (University of Tsukuba)\nWe a
pply the gradient flow method to Nf=2+1 full QCD at finite temperature.\nO
ur main interest is on temperature dependence of:\n1. energy-momentum tens
or with quark contribution\,\n2. chiral condensate and its susceptibility.
\nWe show that these observables are well measured with the gradient flow
method.\nOur finite temperature system is constructed by fixing the lattic
e spacing and varying\nthe temporal length Nt (fixed scale method).\nWe ad
opt the 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 va
lue.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/2/contribution
/43
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/2/contribution/43
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:20170823T133853Z
UID:indico-contribution-530-41@cern.ch
DESCRIPTION:Speakers: Prof. KANAYA\, Kazuyuki (CiRfSE\, Univ. Tsukuba)\nWe
study the temperature-dependence of the topological susceptibility\, dete
rmined in (2+1)-flavor QCD with improved Wilson quarks. To calculate the t
opological charge and its susceptibility\, we adopt the gradient flow meth
od. With heavy up and down quarks ($m_{\\rm PS}/m_V \\approx 0.63$) and a
pproximately physical strange quark\, we study in the range $T=174-697$ Me
V.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/6/contribution/4
1
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/6/contribution/41
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:20170823T133853Z
UID:indico-contribution-530-3@cern.ch
DESCRIPTION:Speakers: Prof. BEDAQUE\, Paulo (University of Maryland)\nWe d
iscuss an approach to solve the sign problem based on deforming the region
of integration in the path integral from real fields to a manifold in com
plex space. It generalizes the"Lefschetz thimble" approach that received m
uch attention lately. We discuss principles through a simple geometrical p
icture\, discuss algorithm features required to make the idea work and pre
sent examples 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/session/3/contribution/3
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/3/contribution/3
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:20170823T133853Z
UID:indico-contribution-530-5@cern.ch
DESCRIPTION:Speakers: Dr. NAGATA\, Keitaro (KEK\, Theory Center)\nRecently
\, the complex Langevin method has been applied successfully to finite den
sity QCD either in the deconfinement phase or in the heavy dense limit wit
h 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 the singularity in the drift term caused by small eigenvalues of the D
irac operator including the mass term. We propose that this singular-drift
problem should also be overcome by the gauge cooling with different crite
ria for choosing the complexified gauge transformation. \n\nI will explain
the idea of our method\, what criteria allows us to avoid the singular dr
ift problem. Applying the method to chiral Random Matrix Theory\, I will s
how that the method indeed works for the chRMT\, where the gauge cooling c
hanges drastically the eigenvalue distribution of the Dirac operator measu
red during the Langevin process. This change of the eigenvalue distributio
n is explained by a generalized Banks-Casher relation. \nI will also pres
ent a result for finite density QCD in the confinement phase. \n\n\nK. Nag
ata\, J. Nishimura\, S. Shimasaki\, arXiv:1604.07717\, arXiv:1511.08580.\n
\nhttps://conference.ippp.dur.ac.uk/event/530/session/4/contribution/5
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/4/contribution/5
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:20170823T133853Z
UID:indico-contribution-530-4@cern.ch
DESCRIPTION:Speakers: Dr. NAKAMURA\, Yoshifumi (RIKEN)\nWe investigate the
critical endline of the finite temperature phase transition of QCD aroun
d the SU(3)-flavor symmetric point at zero chemical potential.\nWe employ
the renormalization-group improved Iwasaki gauge action and non-perturbati
vely $O(a)$-improved Wilson-clover fermion action.\nThe critical endline
is determined by using the intersection point of kurtosis\, employing the
multi-parameter\, multi-ensemble reweighting method to calculate observabl
es off the SU(3)-symmetric point\, at the temporal size $N_{\\rm T}$=6 an
d lattice spacing as low as $a \\approx 0.19$ fm.\nWe confirm that the slo
pe of the critical endline takes the value of $-2$\, and find that the s
econd derivative is positive\, at the SU(3)-flavor symmetric point on the
Columbia plot parametrized with the strange quark mass $m_s$ and degenerat
ed up-down quark mass $m_{\\rm l}$.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/530/session/7/contribution/4
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/7/contribution/4
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:20170823T133853Z
UID:indico-contribution-530-7@cern.ch
DESCRIPTION:Speakers: Prof. STAMATESCU\, Ion-Olimpiu (I.T.P.\, University
Heidelberg)\nZeroes in the fermionic determinant induce poles in the drift
\nof the Langevin equation. We here study their effect on Complex Langevin
\nsimulations in an effective model related to QCD in the limit of heavy q
uarks \nand large chemical potential. The latter was defined long ago by o
ne of the authors and \nused thereafter in various contexts. \nWe approach
in this way a\nquantitative understanding of the conditions for reliabil
ity\nand define systematic errors for the results which could be extended
to\n realistic lattice simulations.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/530/session/1/contribution/7
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/7
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:20170823T133853Z
UID:indico-contribution-530-9@cern.ch
DESCRIPTION:Speakers: Dr. SINCLAIR\, Donald (Argonne-Seville)\nWe simulate
Lattice QCD with 2 light quark flavours at zero temperature and finite qu
ark number chemical potential $\\mu$. Gauge cooling is applied\, along wit
h adaptive rescaling of the updating `time' increment\, to stabilize the a
lgorithm. We see evidence for the expected transition at $\\mu \\approx m_
N/3$ and for saturation at large $\\mu$. Limitations of the method are dis
cussed.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/4/contribut
ion/9
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/4/contribution/9
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:20170823T133853Z
UID:indico-contribution-530-8@cern.ch
DESCRIPTION:Speakers: Dr. ZAFEIROPOULOS\, Savvas (Goethe University Frankf
urt)\nWe study a Random Matrix Model for QCD at finite density via Complex
Langevin dynamics. This model has a phase transition to a phase with non-
zero baryon density. We study the convergence of the algorithm as a functi
on of the quark mass and the chemical potential and focus on two main obse
rvables: the baryon density and the chiral condensate. As expected\, for s
imulations close to the chiral limit\, the algorithm has wrong convergence
properties when the quark mass is in the spectral domain of the quenched
Dirac operator. Possible solutions of this problem are discussed.\n\nhttp
s://conference.ippp.dur.ac.uk/event/530/session/1/contribution/8
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/8
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:20170823T133853Z
UID:indico-contribution-530-49@cern.ch
DESCRIPTION:Speakers: Mr. ATTANASIO\, Felipe (Swansea University)\nComplex
Langevin simulations have been able to successfully reproduce results fro
m Monte Carlo methods in the region where the sign problem is mild and mak
e predictions when it is exponentially hard. We present here our study of
the QCD phase diagram in the limit of heavy and dense quarks (HDQCD) for 3
different lattice volumes and the boundary between the hadronic phase and
the quark-gluon plasma. We also discuss instabilities encountered in our
simulations.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/4/cont
ribution/49
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/4/contribution/49
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:20170823T133853Z
UID:indico-contribution-530-71@cern.ch
DESCRIPTION:Speakers: Mr. THOMAS\, Dean (Swansea University)\nTopology dri
ven techniques are an important and established tool in volume visualisati
on computer graphics\; however\, they have yet to see widespread adoption
in the lattice QCD community. In comparison to traditional isosurfacing a
lgorithms they offer a number of advantages including faster rendering spe
eds and enhanced data exploration possibilities. The ability to summarise
the topology of a scalar field is achieved using various graph based data
structures and algorithms. In our work we use these techniques to visual
ise and quantify the topological effects experienced in SU(2) lattice gaug
e theory as chemical potential is varied.\n\nhttps://conference.ippp.dur.a
c.uk/event/530/session/1/contribution/71
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/71
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Matter from the lattice
DTSTART;VALUE=DATE-TIME:20160803T130000Z
DTEND;VALUE=DATE-TIME:20160803T134500Z
DTSTAMP;VALUE=DATE-TIME:20170823T133853Z
UID:indico-contribution-530-70@cern.ch
DESCRIPTION:Speakers: Dr. FLEMING\, George (Yale University)\nhttps://conf
erence.ippp.dur.ac.uk/event/530/session/7/contribution/70
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/7/contribution/70
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:20170823T133853Z
UID:indico-contribution-530-15@cern.ch
DESCRIPTION:Speakers: Prof. KIM\, Seyong (Sejong University)\nThe thermal
Sommerfeld factor\, concerning the co-annihilation rate\nof heavy quarks i
n thermal equilibrium\, is shown that it can be\ndefined in terms of two-p
oint correlator ratios. Then\, we calculate\nnon-perturbatively the co-ann
ihilation rate of heavy quarks close to\nthermal equilibrium using lattice
NRQCD framework. Lattice\nmeasurements indicate a modest suppression in t
he octet channel\, in\nreasonable agreement with perturbation theory\, and
a large enhancement\nin the singlet channel\, much above the perturbative
prediction. The\nadditional enhancement is suggested to originate from bo
und state\nformation and subsequent decay\, omitted in previous estimates
of\nthermal Sommerfeld factors\, which were meant for use in Boltzmann\neq
uations governing single-particle phase space distributions. We show\nhow
bound state effects can be included in perturbative\ncomputations. The lat
ter formalism may find applications also in\nspecific dark matter models.\
n\nhttps://conference.ippp.dur.ac.uk/event/530/session/2/contribution/15
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/2/contribution/15
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:20170823T133853Z
UID:indico-contribution-530-14@cern.ch
DESCRIPTION:Speakers: Dr. RATTI\, Claudia (University of Houston)\nI will
review the most recent results on QCD thermodynamics from lattice simulati
ons. In particular\, I will focus on the equation of state at zero and fin
ite chemical potential\, the curvature of the QCD phase diagram and fluctu
ations of conserved charges. The latter will be discussed in relation with
the experimental Beam Energy Scan program at RHIC.\n\nhttps://conference.
ippp.dur.ac.uk/event/530/session/6/contribution/14
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/6/contribution/14
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:20170823T133853Z
UID:indico-contribution-530-11@cern.ch
DESCRIPTION:Speakers: Dr. TANIZAKI\, Yuya (RIKEN BNL Research Center)\nIf
the classical action takes complex values\, the path integral formulation
of quantum field theories suffers from the sign problem\, and some artific
e becomes necessary in order to study their nonperturbative properties. Th
e idea to complexify field variables is a candidate for such tricks\, and
there are two methods belonging into this category: Lefschetz-thimble path
integral and complex Langevin method. In this talk\, I will review recent
progress of Lefschetz-thimble path integral with its brief introduction\,
and try to reconsider about complex Langevin method from this point of vi
ew.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/3/contribution/
11
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/3/contribution/11
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:20170823T133853Z
UID:indico-contribution-530-10@cern.ch
DESCRIPTION:Speakers: Prof. HEINZ\, Ulrich (The Ohio State University)\nRe
cent experimental data from p+Pb and high-multiplicity p+p collisions at t
he LHC\, as well as p+Au\, d+Au and He3+Au collisions at RHIC\, suggest st
rongly that the same collective phenomena that have been attributed to hyd
rodynamic flow in collisions between heavy nuclei also manifest in qualita
tively identical ways in collisions where one or both collision partners a
re as small as a proton. How can this be??! To resolve this surprise\, I w
ill discuss the conditions under which hydrodynamic behavior can be expect
ed\, and show that modern (resummed) versions of viscous fluid dynamics th
at account more efficiently for unavoidable strong local momentum anisotro
pies in rapidly and strongly anisotropically expanding systems can quite a
ccurately describe the evolution of fireballs whose local phase-space dist
ribution is far from thermal equilibrium. I will argue that the largest st
umbling block on the way towards a quantitative dynamical understanding of
the evolution of small collision systems is not a likely breakdown of the
hydrodynamic framework\, but our insufficient knowledge of the internal s
patial structure of the proton and its quantum fluctuations from collision
event to event. Some recent suggestions for improved modelling of the ini
tial-state fluctuations in small collision systems will be reported.\n\nht
tps://conference.ippp.dur.ac.uk/event/530/session/0/contribution/10
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/0/contribution/10
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:20170823T133853Z
UID:indico-contribution-530-39@cern.ch
DESCRIPTION:Speakers: Dr. FRANCIS\, Anthony (York University)\nWe present
results on the isovector vector channel spectral functions at vanishing mo
mentum across the deconfinement phase transition in dynamical $n_f=2$ latt
ice QCD. Using Wilson-Clover fermions the calculations are carried out wit
h a vacuum 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 fro
m local-conserved vector correlation functions by fitting a phenomenologic
ally motivated Ansatz and enforcing exact sum rules to the data. We show r
esults for the electrical conductivity across the deconfinement phase tran
sition and find evidence for the dissociation of the $\\rho$-meson. In add
ition we apply the Backus-Gilbert method to our data and compare kinetic t
heory predictions and previously published phenomenological spectral funct
ions to our lattice study.\n\nhttps://conference.ippp.dur.ac.uk/event/530/
session/1/contribution/39
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/39
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:20170823T133853Z
UID:indico-contribution-530-12@cern.ch
DESCRIPTION:Speakers: Dr. BRAGUTA\, Victor (ITEP)\nThis report is devoted
to the study of temperature dependence of shear viscosity in SU(3)-gluodyn
amics. \nTo calculate shear viscosity we measured the correlation function
of the energy-momentum tensor\nT_{12}T_{12} for a set of temperatures in
the region T/T_c \\in (0.9\, 1.5). The measurements \nwere carried out us
ing multilevel algorithm which considerably improves the accuracy \nof the
data. The results of the calculation allow to determine temperature depen
dence of \nthe ratio of shear viscosity to the entropy density {\\eta}/s.\
n\nhttps://conference.ippp.dur.ac.uk/event/530/session/2/contribution/12
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/2/contribution/12
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stochastic Quantization with Colored Noise
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20170823T133853Z
UID:indico-contribution-530-59@cern.ch
DESCRIPTION:Speakers: Mr. ZIEGLER\, Felix (Heidelberg University)\nStudyin
g the topological properties of the QCD vacuum on the lattice\, observable
s such as the gauge action density are blurred by short distance fluctuati
ons at scales of the order of the lattice spacing.\nTo extract the physica
l content from the mentioned configurations\, those have to be treated usi
ng smoothing methods such as cooling or the Wilson flow which have been in
vestigated extensively over the past years. \nWe present an alternative me
thod based on stochastic quantization with UV regulated noise enabling a d
irect control of the quantum fluctuations at all lattice momentum scales.
Our particular interest is to investigate the correspondence between the f
low time and the associated physical scale of the system. Thereto observab
les depending on the long-range physics such as topological quantities are
investigated.\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 a
re analyzed. Moreover\, we investigate whether physical quantities become
insensitive to UV fluctuations above a characteristic momentum scale.\nThe
suitability and efficiency of the method regarding the generation of smoo
thed fields in a Monte Carlo simulation is probed. We present and discuss
our recent results.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session
/1/contribution/59
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/59
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:20170823T133853Z
UID:indico-contribution-530-58@cern.ch
DESCRIPTION:Speakers: Dr. DE FORCRAND\, Philippe (ETH Zurich &\; CERN)\
nAbove the Curie temperature\, the Ising model partition function can\nvan
ish under the effect of an imaginary magnetic field\, as first\nshown by L
ee and Yang. This system has a severe sign problem.\nWe study it numerical
ly\, using the density of states method.\nIn particular\, we consider how
the computer effort scales with\nthe system size.\n\nhttps://conference.ip
pp.dur.ac.uk/event/530/session/3/contribution/58
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/3/contribution/58
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryons across the deconfinement transition
DTSTART;VALUE=DATE-TIME:20160801T162500Z
DTEND;VALUE=DATE-TIME:20160801T183000Z
DTSTAMP;VALUE=DATE-TIME:20170823T133853Z
UID:indico-contribution-530-17@cern.ch
DESCRIPTION:Speakers: Prof. AARTS\, Gert (Swansea University)\nUnlike meso
ns\, lattice studies of baryons at finite temperature are very\nlimited. W
e present results for baryon correlators and spectral functions\nacross th
e deconfinement transition\, using the FASTSUM 2+1 flavour\nensembles as w
ell as results with free lattice fermions.\n\nhttps://conference.ippp.dur.
ac.uk/event/530/session/1/contribution/17
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/17
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:20170823T133853Z
UID:indico-contribution-530-16@cern.ch
DESCRIPTION:Speakers: Ms. HAJIZADEH\, Ouraman (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 de
nsity on the lattice\, as it has no sign problem\, and at the\nsame time h
as a neutron.\n\nTherefore\, this theory can sustain in princple neutron s
tar. Using the\nequation of state for this theory from lattice simulations
\, we solve the\nOppenheimer-Volkoff equation and obtain the mass-radius-r
elation of such\nneutron stars.\n\nThis study shows how different phases\,
visible in the equation of state\,\ninfluence the mass-radius relation\,
and therefore gives guidance for the\ncase of full QCD and true neutron st
ars.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/1/contribution
/16
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/16
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:20170823T133853Z
UID:indico-contribution-530-32@cern.ch
DESCRIPTION:Speakers: Dr. KARTHIK\, Nikhil (Florida International Universi
ty)\nWe present results from our lattice simulation of parity-invariant\nt
hree-dimensional QED with two dynamical flavors of massless\ntwo-component
fermions\, implemented using the overlap operator.\nContradictory to the
expectation from various plausibility arguments\,\nwe find evidences from
the finite-size scaling of eigenvalues of the\nDirac operator and from co
rrelators of fermion bilinears\, for the\ntwo flavor theory to be scale-in
variant with the mass anomalous\ndimension close to 1\, the maximum allowe
d value for a conformal\nfield theory.\n\nhttps://conference.ippp.dur.ac.u
k/event/530/session/0/contribution/32
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/0/contribution/32
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:20170823T133853Z
UID:indico-contribution-530-56@cern.ch
DESCRIPTION:Speakers: Dr. BORSANYI\, Szabolcs (University of Wuppertal)\nW
e calculate the QCD cross-over temperature\, the equation of state and flu
ctuations of conserved charges at finite density by analytical continuatio
n from imaginary to real chemical potentials. Our calculations are based o
n new continuum extrapolated lattice simulations using the 4stout staggere
d actions with a lattice resolution up to Nt=16. The simulation parameters
are tuned such that the strangeness neutrality is maintained\, as it is i
n heavy ion collisions.\n\nhttps://conference.ippp.dur.ac.uk/event/530/ses
sion/1/contribution/56
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/56
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:20170823T133853Z
UID:indico-contribution-530-51@cern.ch
DESCRIPTION:Speakers: Dr. RANTAHARJU\, Jarno (CP3-Origins)\nWe present lat
tice investigations of the SU(2) gauge theory with two fermions in the fun
damental representation. This model provides a minimal template which is i
deal for a wide class of Standard Model extensions featuring novel strong
dynamics that range from composite (Goldstone) Higgs theories to several i
ntriguing types of dark matter candidates. In the light of these results\,
we discuss models of SIMP-\, symmetric- and asymmetric dark matter. We es
timate the interaction of the dark matter candidate with Standard Model pa
rticles through it’s electric polarisability and discuss experimental co
nstraints on these models.\n\nhttps://conference.ippp.dur.ac.uk/event/530/
session/7/contribution/51
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/7/contribution/51
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:20170823T133853Z
UID:indico-contribution-530-36@cern.ch
DESCRIPTION:Speakers: Dr. BONATI\, Claudio (Università di Pisa)\nWe will
present a determination of the topological properties of QCD for temperatu
res up to around 600MeV\, obtained by using Lattice QCD simulations with 2
+1 flavours of fermions at the physical point. Numerical results will be
compared with the predictions of instanton gas calculations and the implic
ations of these results for the cosmological bounds on the axion mass will
be discussed.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/6/co
ntribution/36
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/6/contribution/36
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:20170823T133853Z
UID:indico-contribution-530-53@cern.ch
DESCRIPTION:Speakers: Dr. BRANDT\, Bastian (University of Frankfurt)\nWe s
tudy the strength of the anomalous breaking of the $U_A(1)$ symmetry in th
e chiral limit of two-flavour QCD at the transition temperature using the
difference of the pseudoscalar and scalar iso-vector screening masses. To
this end we use simulations with non-perturbatively $O(a)$-improved Wilson
fermions for three different pion masses in the range of 200-550MeV on la
ttices with a temporal extent of 16 and volumes of $32^3$ to $64^3$. We co
mpare our results to the strong breaking at zero temperature and find that
the effect of the breaking in the mass difference is reduced by at least
a factor of five. This indicates a weak $U_A(1)$ breaking at the transitio
n temperature and raises the question of its influence on the nature of th
e chiral transition. It is generally expected that a weaker breaking stren
ghtens the chiral phase transition.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/530/session/1/contribution/53
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/53
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:20170823T133853Z
UID:indico-contribution-530-34@cern.ch
DESCRIPTION:Speakers: Dr. JAEGER\, Benjamin (Swansea University)\nComplex
Langevin methods have been successfully applied in theories that suffer fr
om a sign problem such as HDQCD. We present and illustrate a novel method
that ensures that Complex Langevin simulations stay close to the SU(3) man
ifold\, which lead to correct and improved results in the framework of HDQ
CD and pure gauge simulations. Applying the same technique in fully dynami
cal QCD simulations shows great potential to allow the determination of th
e phase diagram from first principles.\n\nhttps://conference.ippp.dur.ac.u
k/event/530/session/1/contribution/34
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/34
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:20170823T133853Z
UID:indico-contribution-530-19@cern.ch
DESCRIPTION:Speakers: Dr. CASALDERREY SOLANA\, Jorge (University of Oxford
)\nWe numerically simulate gravitational shock wave collisions in a hologr
aphic model dual to a non-conformal four-dimensional gauge theory. We find
two novel effects associated to the non-zero bulk viscosity of the result
ing plasma. First\, the hydrodynamization time increases. Second\, if the
bulk viscosity is large enough then the plasma becomes well described by h
ydrodynamics before the equilibrium equation of state becomes applicable.
We discuss implications for the quark-gluon plasma created in heavy ion co
llision experiments.\n\nhttps://conference.ippp.dur.ac.uk/event/530/sessio
n/2/contribution/19
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/2/contribution/19
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:20170823T133853Z
UID:indico-contribution-530-55@cern.ch
DESCRIPTION:Speakers: Prof. LUCINI\, Biagio (Swansea University)\nMost of
the successes of lattice QCD are strictly connected with advances in numer
ical methods. In particular\, importance sampling Monte Carlo methods have
underpinned lattice QCD calculations since the early days of the field. H
owever\, it is well known that importance sampling methods fail in cases w
hen one has to sample over configurations whose occurrence is suppressed b
y the Monte Carlo measure. Typical examples are first order phase transiti
ons\, in which two equally probable equilibrium states are connected by co
nfigurations with probability of occurrence exponentially suppressed with
the system size\, or the sign problem\, whereby strong cancellations occur
ring for observables evaluated over highly probable configurations give a
high relative weight to less recurring states. A possible way around these
problems is a direct sampling of the density of states through a non-Mark
ovian Random Walk in configuration space\, as proposed by Wang and Landau
a few years ago. In this contribution\, I review the Logarithmic Linear Re
laxation (LLR) method\, a recently introduced algorithm in the Wang-Landau
class that allows us to determine density of states over several orders o
f magnitude with the same relative accuracy. After an introduction to the
ideas inspiring the algorithm and the presentation of some practical imple
mentations\, I discuss some applications to spin and gauge systems\, with
emphasis on the sign problem and the challenges it presents.\n\nhttps://co
nference.ippp.dur.ac.uk/event/530/session/3/contribution/55
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/3/contribution/55
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:20170823T133853Z
UID:indico-contribution-530-37@cern.ch
DESCRIPTION:Speakers: Dr. MIURA\, Kohtaroh (Centre de Physique Theorique\,
Aix-Marseille Universite)\nNovel (quasi-)conformal dynamics associated wi
th Infra-red fixed point is anticipated to emerge in many-flavor QCD\, and
advocated as a basis for strongly-interacting mechanisms of electroweak s
ymmetry breaking. The subject is closely related to the critical phenomena
of chiral phase transition in usual (3-flavour) QCD. In this regard\, we
show the latest lattice simulation (LatKMI) results for the scaling proper
ty of 8-flavor QCD. Also\, motivated by the Baryogenesis\, we discuss ther
modynamic properties of 8-flavour QCD.\n\nhttps://conference.ippp.dur.ac.u
k/event/530/session/7/contribution/37
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/7/contribution/37
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:20170823T133853Z
UID:indico-contribution-530-48@cern.ch
DESCRIPTION:Speakers: ROYO\, Eduardo (Universidad de Zaragoza)\nUnderstand
ing the role of the $\\theta$ parameter in QCD and its\nconnection with th
e strong CP problem and axion physics is one of the\nmajor challenges for
high energy theorists. Due to the sign problem\,\nat present only the QCD
topological susceptibility is well\nknown. Using an algorithmic approach t
hat 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
conjecture of\nColeman.\n\nhttps://conference.ippp.dur.ac.uk/event/530/ses
sion/1/contribution/48
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/48
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:20170823T133853Z
UID:indico-contribution-530-31@cern.ch
DESCRIPTION:Speakers: Mr. NIKOLAEV\, Aleksandr (ITEP)\nIn this talk we pre
sent our results on the low-temperature scan of the phase diagram of dense
two-color QCD with two flavors of quarks. The study is conducted using la
ttice simulation with rooted staggered quarks and real baryon chemical pot
ential. At small chemical potential we observe the hadronic phase\, where
the theory is in a confining state\, chiral symmetry is broken\, the baryo
n density is zero and there is no diquark condensate. At the critical poin
t $\\mu = m_{\\pi}/2$ we observe the expected second order transition to B
ose-Einstein condensation of scalar diquarks. In this phase the system is
still in confinement in conjunction with non-zero baryon density\, but the
chiral symmetry is restored in the chiral limit. We have also found that
in the first two phases the system is well described by chiral perturbatio
n theory. For larger values of the chemical potential the system turns int
o another phase\, where the relevant degrees of freedom are fermions resid
ing inside the Fermi sphere\, and the diquark condensation takes place on
the Fermi surface. In this phase the system is still in confinement\, chir
al symmetry is restored and the system is very similar to the quarkyonic s
tate predicted by SU($N_c$) theory at large $N_c$.\n\nhttps://conference.i
ppp.dur.ac.uk/event/530/session/7/contribution/31
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/7/contribution/31
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:20170823T133853Z
UID:indico-contribution-530-50@cern.ch
DESCRIPTION:Speakers: Dr. WAGNER\, Mathias (NVIDIA)\nAnalysis tasks in Lat
tice QCD thermodynamics often requires solving linear equations for multip
le right hand sides for a constant gauge field. Recently deflation methods
have become more widely used and proven to be very efficient. They howeve
r do require the calculation and storing of eigenvectors which is either n
ot always feasible or suffer from high setup costs. We present results for
an implementation of a block solver for multiple right hand sides using t
he QUDA library for QCD on NVIDIA GPUs. By making use of the gauge field r
euse in the Dslash operator\, mixed precision approaches and block Krylov
space methods they do provide outstanding solver performance. We present r
esults on NVIDIA's most recent Pascal architecture. Furthermore we provide
an update on the QUDA library and overview of NVIDIA's Pascal architectur
e.\n\nhttps://conference.ippp.dur.ac.uk/event/530/session/1/contribution/5
0
LOCATION:Plymouth University Portland Square
URL:https://conference.ippp.dur.ac.uk/event/530/session/1/contribution/50
END:VEVENT
END:VCALENDAR