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BEGIN:VEVENT
SUMMARY:The spectra of (closed) confining flux tubes in D=3+1 and D=2+1 SU
(N) gauge theories.
DTSTART;VALUE=DATE-TIME:20160729T142000Z
DTEND;VALUE=DATE-TIME:20160729T144000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2663@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Michael Teper (University of Oxford)\nWe summarise t
he most striking features of the spectra of closed\nconfining flux tubes\,
for the flux in the fundamental\nand some other representations. We compa
re to recent theoretical\npredictions. In $D=2+1$ we present results for t
he continuum string\ntensions for theories ranging from SU(2) to SU(16) an
d we determine\nthe leading correction to the N-dependence of k-strings.\n
\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2663/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2663/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flux Tubes in QCD with (2+1) HISQ Fermions
DTSTART;VALUE=DATE-TIME:20160729T144000Z
DTEND;VALUE=DATE-TIME:20160729T150000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2658@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Leonardo Cosmai (INFN)\nWe investigate the transvers
e profile of the chromoelectric field\ngenerated by a quark-antiquark pair
in the vacuum of (2+1) flavor QCD.\nMonte Carlo simulations are performed
adopting the HISQ/tree action \ndiscretization\, as implemented in the pu
blicly available MILC code\, \nsuitably modified to measure the chromoelec
tric field. \nWe work on the line of constant physics\, with physical stra
nge quark mass\nm_s and light to strange mass ratio m_l/m_s = 1/20.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2658/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2658/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Squared width and profile of the confining fluxtube in the U(1) LG
T in 3D
DTSTART;VALUE=DATE-TIME:20160729T134000Z
DTEND;VALUE=DATE-TIME:20160729T140000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2656@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Vadacchino Davide (Universita' degli Studi di Torino
- INFN Torino)\nThe dual formulation of the compact U(1) lattice gauge th
eory in three spacetime dimensions allows to finely study the squared widt
h and the profile of the confining fluxtube on a wide range of physical in
terquark distances. The results obtained in Montecarlo simulations are com
pared with the predictions of the effective bosonic-string model and with
the dual superconductor model. While the former fails at describing the da
ta from a quantitative point of view\, the latter is in good agreement wit
h it. An interpretation of these results is proposed in light of the parti
cular features of the U(1) LGT in 3D and a comparison with non-Abelian gau
ge theories in four spacetime dimensions is discussed.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/470/contributions/2656/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2656/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Triple-gluon and quark-gluon vertex from lattice QCD in Landau gau
ge
DTSTART;VALUE=DATE-TIME:20160729T165000Z
DTEND;VALUE=DATE-TIME:20160729T171000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2646@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andre Sternbeck (University of Jena)\nWe report on n
ew results for the triple-gluon and the quark-gluon vertex in Landau gauge
. Our results are based on two-flavor and quenched lattice QCD calculation
s for different quark masses\, lattice spacings and\nvolumes. We will focu
s on the momentum dependence of the different tensor structures.\n\nhttps:
//conference.ippp.dur.ac.uk/event/470/contributions/2646/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2646/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theta dependence in the large N limit
DTSTART;VALUE=DATE-TIME:20160729T130000Z
DTEND;VALUE=DATE-TIME:20160729T132000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2639@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Claudio Bonati (Università di Pisa)\nStudies of the
large N behaviour of the topological properties of gauge theories typical
ly focused on the large N scaling of the topological susceptibility. A muc
h more difficult task is the study of the behaviour of higher cumulants of
the topological charge in the large N limit\, which up to now remained el
usive. We will present first results confirming the expected large N scal
ing of the coefficient commonly denoted by b_2\, related to the kurtosis o
f the topological charge.\n\nhttps://conference.ippp.dur.ac.uk/event/470/c
ontributions/2639/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2639/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Landau gauge gluon vertices from Lattice QCD
DTSTART;VALUE=DATE-TIME:20160729T171000Z
DTEND;VALUE=DATE-TIME:20160729T173000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2622@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Paulo Silva (Center for Physics\, University of Coim
bra)\nIn lattice QCD the computation of one-particle irreducible (1PI) Gre
en's functions with a large number (> 2) of legs is a challenging task. Be
sides tuning the lattice spacing and volume to reduce finite size effects\
, the problems associated with the estimation of higher order moments via
Monte Carlo methods and the extraction of 1PI from complete Green's functi
ons are limitations of the method. Herein\, we address these problems revi
siting the calculation of the three gluon 1PI Green's function\, with emph
asis in the infrared region and providing a first look at the four gluon v
ertex.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2622/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2622/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effects of magnetic fields on quark-antiquark interactions
DTSTART;VALUE=DATE-TIME:20160729T140000Z
DTEND;VALUE=DATE-TIME:20160729T142000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2609@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andrea Rucci (University of Pisa and INFN Pisa)\nI w
ill discuss some recent results obtained in the study of the strong quark-
antiquark\ninteraction in the presence of intense external magnetic fields
. At zero temperature\nthe external field induces anisotropies in the stat
ic quark potential\, that affect both\nthe spectrum and the decays of the
heavy mesons. In the quark-gluon plasma phase\nthe screening masses do not
show significant anisotropies but display a non-trivial\ndependence on th
e magnetic field.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribut
ions/2609/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2609/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complete Monopole Dominance of the Static Quark Potential
DTSTART;VALUE=DATE-TIME:20160729T155000Z
DTEND;VALUE=DATE-TIME:20160729T161000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2587@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nigel David Cundy (Seoul National University)\nIn ea
rlier work\, we used a gauge independent Abelian Decomposition to show tha
t Abelian degrees of freedom where wholly responsible for the static quar
k postential. The Abelian decomposition contains a Maxwell part and Topolo
gical part\, whose contribution to the string tension can be analysed theo
retically and numerically\, and arises because of the existence of a certa
in type of monopole. If we also fix the gauge in a certain way\, we show t
hat the Topological part can wholly account for the string tension. We sho
w using numerical simulations in SU(2) Yang-Mills theory that the monopole
s which can at least partially explain confinement are present in the QCD
vacuum.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2587/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2587/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark confinement to be caused by Abelian or non-Abelian dual supe
rconductivity in the $SU(3)$ Yang-Mills theory
DTSTART;VALUE=DATE-TIME:20160729T161000Z
DTEND;VALUE=DATE-TIME:20160729T163000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2543@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\, that enables us to change the original non-Abelian gauge field int
o the new field variables such that one of them called the restricted fiel
d gives the dominant contribution to quark confinement in the gauge-indepe
ndent way. \n We have pointed out that the $SU(3)$ Yang-Mills theory has
a new way of reformulation using new field variables (minimal option)\, i
n addition to the conventional option adopted by Cho\, Faddeev and Niemi (
maximal option). In the preceding lattice conferences\, we have accumulat
ed the numerical evidences that support the non-Abelian dual superconduct
ivity using the minimal option for the SU(3) Yang-Mills theory. This shou
ld be compared with Abelian dual superconductivity from the maximal optio
n which is a gauge invariant version of the conventional Abelian projectio
n method in the maximal Abelian gauge. \n In this talk\, We focus on di
scriminating between two reformulations\, i.e.\, maximal and minimal optio
ns of $SU(3)$ Yang-Mills theory for quark confinement from the viewpoint
of dual superconductivity. We investigate the dual Meissner effect at fin
ite temperature and the phase transition in both options which are compare
d with the original Yang-Mills theory. For this purpose\, we measure the
distribution of the chromoelectric flux connecting a quark and an antiquar
k and the induced magnetic-monopole current around the flux tube in both c
onfinement/deconfinement phase. \n\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/470/contributions/2543/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2543/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The large $N$ limit of the topological susceptibility of Yang-Mill
s gauge theory
DTSTART;VALUE=DATE-TIME:20160729T132000Z
DTEND;VALUE=DATE-TIME:20160729T134000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2521@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Miguel Francisco Garcia Vera (NIC\, DESY & Humboldt
Universitat zu Berlin)\nWe present a precise computation of the topologica
l susceptibility $\\chi$ of SU($N$) Yang–Mills theory in the large-$N$ l
imit. The computation is done on the lattice\, using high-statistics Monte
Carlo simulations of the SU($N$) Yang-Mills theories\, with $N=3\, 4\, 5\
, 6$ and three different lattice spacings. Two major improvements allowed
us to go to finer lattice spacing and larger $N$ compared to previous work
s. First\, the topological charge is implemented through the gradient flow
definition\; and second\, open boundary conditions in the time direction
are employed in order to avoid the freezing of the topological charge. Our
results allow us to extrapolate the dimensionless quantity $t_0^2\\chi$ t
o the continuum and large-$N$ limits with confidence. The accuracy of our
final result represents a new quality in the verification of large-$N$ sca
ling.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2521/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2521/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Centre vortices are the seeds of dynamical chiral symmetry breakin
g
DTSTART;VALUE=DATE-TIME:20160729T153000Z
DTEND;VALUE=DATE-TIME:20160729T155000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2464@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Waseem Kamleh (University of Adelaide)\nWe reveal a
fundamental connection between centre\nvortices and several key features a
ssociated with dynamical\nchiral symmetry breaking and quark confinement.
Calculations are\nperformed in pure $\\mathrm{SU}(3)$ gauge theory using t
he chiral\noverlap fermion action. Starting from the original gauge field\
, a\nvortex identification procedure yields vortex-removed and vortex-only
\nbackgrounds. By studying the quark mass function\, we demonstrate the\nr
emoval of dynamical mass generation via the removal of the\ncentre-vortex
degrees of freedom from the gauge fields. The low-lying\nhadron mass spect
rum is also calculated\, with results that are\nconsistent with the restor
ation of chiral symmetry on vortex-removed\nbackgrounds at light quark mas
ses.\n\nRemarkably\, we observe that the vortex-only degrees of freedom ar
e\nable to encapsulate the qualitative features of the original gauge\nfie
lds. Through visualisations of the topological charge density\, we\nfind e
vidence of a link between centre vortices and the instanton\nstructure of
the vacuum\, specifically vortex-only backgrounds provide\ngauge-field deg
rees of freedom sufficient to create instantons upon\ncooling. Furthermore
\, after some smoothing\, we observe dynamical mass\ngeneration on the vor
tex-only backgrounds consistent with that of the\noriginal gauge-field ens
emble.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2464/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2464/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Dark Side of the Propagators: analytical approach to QCD in t
he infrared of Minkowski space.
DTSTART;VALUE=DATE-TIME:20160729T163000Z
DTEND;VALUE=DATE-TIME:20160729T165000Z
DTSTAMP;VALUE=DATE-TIME:20200815T054125Z
UID:indico-contribution-492-2437@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Fabio SIRINGO (Dipartimento di Fisica e Astronomia\,
Università di Catania)\nSince most of the non-perturbative approaches to
QCD rely on numerical calculations in the *Euclidean* space\, many import
ant dynamical information cannot be easily extracted because of the ill-de
fined problem of analytic continuation for a limited set of data points.\n
On the other hand\, by a shift of the expansion point\, a perturbative app
roach has been developed[1\,2] that has the nice feature of providing one-
loop analytical functions for the propagators that are in perfect agreemen
t with the data of lattice simulations in the Euclidean space. These funct
ions are generally analytic and can be studied in Minkowski space\, yieldi
ng a direct proof of positivity violation and confinement.\n\nThe expansio
n has been extended to full QCD [3]\, including a set of chiral quarks\, i
n order to give a unified description of dynamical mass generation and chi
ral symmetry breaking\, yielding new insights on the coupled quark\, gluon
and ghost propagators in the infrared of Minkowski space\, that is still
basically unexplored.\n\nWhile dealing with the exact Lagrangian\, the mod
ified expansion is based on *massive* free-particle propagators\, is safe
in the infrared and is equivalent to the standard perturbation theory in t
he UV [2\,3]. By dimensional regularization\, all diverging mass terms can
cel exactly without including spurious mass counterterms that would spoil
the gauge and chiral symmetry of the Lagrangian. If optimized\, the *mass
ive* expansion provides a variational tool disguised to look like a pertur
bative method\, without any phenomenological parameter\, from first princi
ples.\n\nAmong the main findings\, universal scaling properties are predic
ted for the inverse dressing functions and shown to be satisfied by the la
ttice data. Complex conjugated poles are found for the gluon propagator\,
in agreement with the *i-particle* scenario. No complex poles are found fo
r the quark propagators but the positivity constraints of the spectral fun
ctions are badly violated by the explicit presence of\nnegative-norm multi
particle states below the two-particle threshold.\n\n\n----------\n\n\n [1
] F. Siringo\, *Perturbative study of Yang-Mills theory in the infrared*\,
arXiv:1509.05891.\n\n [2] F. Siringo\, *Analytical study of Yang-Mills t
heory in the infrared from first principles*\, Nucl.Phys.B907\, 572 (2016)
\; arXiv:1511.01015.\n\n [3] F. Siringo\, *Analytic structure of QCD propa
gators in Minkowski space*\, arXiv:1605.07357\n\nhttps://conference.ippp.d
ur.ac.uk/event/470/contributions/2437/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2437/
END:VEVENT
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