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VERSION:2.0
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BEGIN:VEVENT
SUMMARY:Dinner
DTSTART;VALUE=DATE-TIME:20171109T190000Z
DTEND;VALUE=DATE-TIME:20171109T210000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-57525@indico.in2p3.fr
DESCRIPTION:Restaurant L'ébauchoir\n43-45 rue de Cîteaux\, Paris 11\n\nM
etro : Faidherbe-Chaligny (line 8)\n\nhttps://indico.in2p3.fr/event/16394/
contributions/57525/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/57525/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Small parameters in infrared QCD (45+15)
DTSTART;VALUE=DATE-TIME:20171110T093000Z
DTEND;VALUE=DATE-TIME:20171110T103000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55941@indico.in2p3.fr
DESCRIPTION:Speakers: Marcela Peláez (Universidad de la República de Mon
tevideo / CPHT-X)\nLattice simulations show that the running coupling cons
tants obtained through QCD vertices differ in the infrared even though the
ir bare values coincide. For instance\, at low momenta the strength of the
quark-gluon coupling is about twice the ghost-gluon coupling. None of the
m diverge in the infrared as it is predicted by standard perturbation theo
ry. Moreover\, the ghost-gluon coupling remains moderate even in the infra
red. This observation motivates the use of perturbation theory in the ghos
t-gluon sector in the frame of a massive deformation of QCD Lagrangian in
Landau gauge. However\, perturbation theory in the quark sector within thi
s massive Lagrangian doesn´t bring as good results as in the pure Yang-Mi
lls case\, as should be expected from the larger value of the quark-gluon
coupling constant.\nWe propose a controlled systematic expansion in full Q
CD based in two small parameters: first the Yang.Mills sector couplings an
d second the inverse of the number of colors (large-Nc limit). The second
approximation relies on the fact that the general features of QCD can be o
bserved in the large-Nc limit. This systematic expansion allows us to prop
erly introduce the use of the renormalization group for the rainbow resumm
ation.\nAt leading order\, this double expansion leads to the well-known r
ainbow approximation for the quark propagator whose solution shows spontan
eous chiral symmetry breaking for sufficiently large quark-gluon coupling
constant.\n\nhttps://indico.in2p3.fr/event/16394/contributions/55941/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55941/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Polyakov-loop potentials for the phenomenological investigation of
the QCD phase structure (45+15)
DTSTART;VALUE=DATE-TIME:20171110T103000Z
DTEND;VALUE=DATE-TIME:20171110T113000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55949@indico.in2p3.fr
DESCRIPTION:Speakers: Rainer Stiele (CPHT - Ecole Polytechnique Palaiseau)
\nPolyakov-loop-extended chiral models are useful to get a glimpse on the
phase structure of strongly-interacting matter. However\, these models rel
y on simple parameterisations of the Polyakov-loop potential and with pres
ent parameter sets different parameterisations give results for pure gauge
theory that differ considerably. Of course this introduces even larger un
certainties when the potential is coupled to quarks in Polyakov-loop-exten
ded chiral models. Therefore\, it is important to find parameter sets for
the different parameterisations such that they agree in their description
of latest lattice data on Yang-Mills theory. Furthermore\, these parametri
sed Polyakov-loop potentials miss so far any information on the slope of t
he potential away from its minimum. But this is the area which determines
the expectation value of the Polyakov loop in Polyakov-loop--extended chir
al models. Hence\, we suggest to include to the existing parameterisations
information about the global shape of the Polyakov-loop potential from ca
lculations in nonperturbative\, continuum approaches. We show how the exis
ting parametrised Polyakov-loop potentials differ from the calculated ones
and which information of the calculated potentials could be included to t
he parameterisations to increase the predictability of the phase structure
of QCD with Polyakov-loop--extended chiral models.\n\nhttps://indico.in2p
3.fr/event/16394/contributions/55949/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55949/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extracting infrared properties of QCD from the Curci-Ferrari model
(45)
DTSTART;VALUE=DATE-TIME:20171108T153000Z
DTEND;VALUE=DATE-TIME:20171108T161500Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55933@indico.in2p3.fr
DESCRIPTION:Speakers: Matthieu Tissier (Université Pierre et Marie Curie)
\nIt is often believed that the infrared regime of QCD is nonperturbative.
This is partly based on the fact that standard perturbation theory predic
ts a coupling constant which diverges at a finite (infrared) momentum scal
e. However lattice simmulations show no clue of such a behavior. Instead\,
the coupling constant is found to be bounded by a constant of order 1\, w
hich could be dealt with in perturbation theory. We review on a phenomenol
ogical approach which consists in adding to the standard Faddeev-Popov act
ion a gluon mass (this model was introduced by Curci and Ferrari in the 70
's). The model has good properties in the infrared regim and the coupling
constant remains finite down to arbitrary small momentum scale\, as seen i
n lattice simulations. We review on the systematic comparison that was per
formed between the 1-loop calculation in this model and lattice simulation
. We finally discuss on possible origins for the gluon mass\n\nhttps://ind
ico.in2p3.fr/event/16394/contributions/55933/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55933/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The massive Landau-de-Witt gauge at finite temperature and density
(45+15)
DTSTART;VALUE=DATE-TIME:20171109T140000Z
DTEND;VALUE=DATE-TIME:20171109T150000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55939@indico.in2p3.fr
DESCRIPTION:Speakers: Urko Reinosa (Ecole Polytechnique Palaiseau)\nWe rev
iew recent results of the massive Landau-de-Witt gauge approach to the des
cription of Yang-Mills and QCD theories at finite temperature and/or densi
ties. In particular we consider the formal but interesting limit of heavy
quarks and compare with other approaches\, including the lattice as a benc
hmark. We also discuss some of the limitations of the method and draw some
parallels with other approaches.\n\nhttps://indico.in2p3.fr/event/16394/c
ontributions/55939/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55939/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Taming Gribov copies via the horizon restriction: done and to do (
50+10)
DTSTART;VALUE=DATE-TIME:20171108T140000Z
DTEND;VALUE=DATE-TIME:20171108T150000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55932@indico.in2p3.fr
DESCRIPTION:Speakers: David Dudal (Leuven University)\nA possible way to d
eal with (small) Gribov copies in the Landau gauge is to restrict the doma
in of integration of the gauge field variables. Such pioneering work was c
arried out by Gribov himself at leading order\, and improved upon to all o
rders by Zwanziger\, an effort culminating in an effective GZ action with
dynamical mass scale. We briefly review this construction\, using the inve
rse ghost propagator as “diagnostic tool” and we mention some underlyi
ng assumptions.\n \nA major shortcoming of the original effective action w
as the incompatibility with BRST invariance. Recent insights allowed to r
eformulate it into a BRST symmetric version\, thereby also opening the roa
d to generalizing the Gribov-Zwanziger approach to other classes of gauges
. We pay particular attention to the linear covariant gauge.\n \nWe discus
s how dynamical effects can alter the action\, resulting in the formation
of (BRST invariant) d=2 condensates. A shortcoming of the current approach
is that these dynamical mass scales are for now obtained by fitting to la
ttice data\, and we propose a strategy to search for self-consistent gap e
quations. It remains to be seen whether such scales will be only qualitat
ively\, or also quantitatively compatible with lattice data.\n \nAt last\,
we briefly turn to the finite T extension when the Polyakov loop is added
to the model via a temporal background gauge field (see other talks). We
discuss and illustrate how previous work (using the GZ original action) is
at odds with background gauge invariance\, a fact under current remediati
on as this can be related to the lack of BRST invariance. Though\, even th
is improvement leaves important challenges\, also present in other approac
hes (see also other talks).\n\nhttps://indico.in2p3.fr/event/16394/contrib
utions/55932/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55932/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analytical study of Yang-Mills theory from first principles by a m
assive expansion (45+15)
DTSTART;VALUE=DATE-TIME:20171109T080000Z
DTEND;VALUE=DATE-TIME:20171109T090000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-56324@indico.in2p3.fr
DESCRIPTION:Speakers: Fabio Siringo (Catania University)\nPure Yang-Mills
theory is studied by perturbation theory\, using an unconventional expansi
on with a massive free-particle gluon propagator. The exact Faddev-Popov L
agrangian is considered in a generic linear covariant gauge. The Gaussian
effective potential is shown to be gauge invariant and minimal at a massiv
e vacuum\, providing a variational argument for mass generation. Loop expa
nding around the optimal massive vacuum\, a massive expansion is recovered
\, yielding dressed propagators that are in very good agreement with the d
ata of lattice simulations in the Landau gauge. No spurious counterterms o
r parameters are required since all the mass divergences are canceled exac
tly in the expansion. At one loop\, the propagators are analytic functions
and can be easily continued to the whole complex plane\, predicting the e
xistence of complex poles for the gluon. Because of the finite damping rat
e\, the gluon is canceled from the asymptotic states\, yielding a microsco
pic proof of confinement.\n\nAt finite temperature\, the same variational
argument provides an optimal mass that depends on temperature. A weak firs
t order transition is observed at T_c=255 MeV where the optimal mass is di
scontinuous. The equation of state is studied and found in good quantitati
ve agreement with the lattice data\, from first principles and without any
free parameter. The poles of the gluon propagator are studied as function
s of temperature and a crossover scenario is found\, with a short intrinsi
c lifetime of the quasi-gluon below T_c and an almost linear damping rate
above T_c\, as expected by standard perturbation theory in the high temper
ature limit.\n\nhttps://indico.in2p3.fr/event/16394/contributions/56324/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/56324/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Revisiting the lattice pure gauge Landau gauge gluon propagator at
zero and finite temperature (45+15)
DTSTART;VALUE=DATE-TIME:20171109T103000Z
DTEND;VALUE=DATE-TIME:20171109T113000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55937@indico.in2p3.fr
DESCRIPTION:Speakers: Orlando Oliveira (Coimbra University)\nThe computati
on of the pure gauge Landau gauge gluon propagator is revisited both at z
ero and finite temperature. For the zero temperature case we discuss the
compatibility of the generalised Gribov-Zwanziger predictions and particul
ar attention is given to the computation of the propagator for temperature
s near the deconfinement phase transition. Preliminary results for the glu
on of the spectral function are also discussed.\n\nhttps://indico.in2p3.fr
/event/16394/contributions/55937/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55937/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Some applications of Renormalization Group Optimized perturbation
at zero and finite temperature (45+15)
DTSTART;VALUE=DATE-TIME:20171109T090000Z
DTEND;VALUE=DATE-TIME:20171109T100000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55936@indico.in2p3.fr
DESCRIPTION:Speakers: Jean-Loïc Kneur (Montpellier University)\nI will il
lustrate how the recently developed renormalization group optimized pertur
bation theory (RGOPT) resums perturbative expansions in vacuum or thermal
field theories. For zero temperature QCD typically\, it gives realistic ap
proximations of the order parameters of chiral symmetry breaking (quark co
ndensate etc). In thermal theories the convergence and scale dependence of
RGOPT thermodynamical quantities are drastically improved as compared to
standard perturbative expansions\, and it cures the odd drastic scale depe
ndence observed in other related methods such as the screened perturbation
or (resummed) hard-thermal-loop (HTL) perturbation. I will present some r
ecent results in scalar models\, and first applications to HTL resummation
for QCD thermodynamical quantities\, also explaining the additionnal calc
ulations needed in gauge theories with respect to standard HTLpt within ou
r framework.\n\nhttps://indico.in2p3.fr/event/16394/contributions/55936/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55936/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On QCD correlation functions at finite temperature (50+10)
DTSTART;VALUE=DATE-TIME:20171109T130000Z
DTEND;VALUE=DATE-TIME:20171109T140000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55938@indico.in2p3.fr
DESCRIPTION:Speakers: Jan Pawlowski (Heidelberg University)\nhttps://indic
o.in2p3.fr/event/16394/contributions/55938/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55938/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Variational approach to gauge theory (50+10)
DTSTART;VALUE=DATE-TIME:20171108T130000Z
DTEND;VALUE=DATE-TIME:20171108T140000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55931@indico.in2p3.fr
DESCRIPTION:Speakers: Hugo Reinhardt (Tübingen University)\nI will review
the covariant variational approach to Yang-Mills theory in Landau gauge a
nd compare it with the Hamiltonian approach. First I will treat the vacum
sector. Then I will study the deconfinement phase transition by calculatin
g the Polyakov loop potential.\n\nhttps://indico.in2p3.fr/event/16394/cont
ributions/55931/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55931/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Landau-gauge Yang-Mills correlation functions from the functional
renormalization group (45+15)
DTSTART;VALUE=DATE-TIME:20171108T103000Z
DTEND;VALUE=DATE-TIME:20171108T113000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55930@indico.in2p3.fr
DESCRIPTION:Speakers: Mario Mitter (Brookhaven National Laboratory)\nhttps
://indico.in2p3.fr/event/16394/contributions/55930/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55930/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Results for Yang-Mills vacuum correlation functions in the Landau
gauge from equations of motion (45+15)
DTSTART;VALUE=DATE-TIME:20171108T093000Z
DTEND;VALUE=DATE-TIME:20171108T103000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55929@indico.in2p3.fr
DESCRIPTION:Speakers: Markus Huber (Graz University)\nRecent results for Y
ang-Mills correlation functions in the Landau gauge from equations of moti
on of 1PI and 3PI effective actions are reviewed. The status of the trunca
tion dependence is discussed on the basis of results for nonprimitively di
vergent correlation functions and for the three-dimensional case. Special
emphasis is put on the renormalization of the underlying equations and per
turbative resummation.\n\nhttps://indico.in2p3.fr/event/16394/contribution
s/55929/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55929/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Poincaré-covariant description of two- and three-body bound state
s from functional approaches to QFT (45+15)
DTSTART;VALUE=DATE-TIME:20171110T080000Z
DTEND;VALUE=DATE-TIME:20171110T090000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55942@indico.in2p3.fr
DESCRIPTION:Speakers: Reinhard Alkofer (Graz University)\nhttps://indico.i
n2p3.fr/event/16394/contributions/55942/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55942/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD 2- and 3-points Green functions: from lattice results to pheno
menology (45+15)
DTSTART;VALUE=DATE-TIME:20171108T080000Z
DTEND;VALUE=DATE-TIME:20171108T090000Z
DTSTAMP;VALUE=DATE-TIME:20190722T062905Z
UID:indico-contribution-16394-55928@indico.in2p3.fr
DESCRIPTION:Speakers: José Rodriguez-Quintero (Huelva University)\nhttps:
//indico.in2p3.fr/event/16394/contributions/55928/
LOCATION:APC 483A - Malevitch
URL:https://indico.in2p3.fr/event/16394/contributions/55928/
END:VEVENT
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