Frontiers of finite temperature lattice QCD

Borsányi, Szabolcs

doi:10.1051/epjconf/201713701006

Cited by 20 publications

(21 citation statements)

References 98 publications

(130 reference statements)

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“…In addition to the standard staggered fermion action we add a diquark source term [27] to equation (1). The diquark source term explicitly violates U V (1) and allows to observe diquark condensation even on finite lattices, because this term effectively chooses one vacuum from the family of U V (1)-symmetric vacua.…”

Section: Simulation Detailsmentioning

confidence: 99%

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Lattice study of static quark-antiquark interactions in dense quark matter

Astrakhantsev

Bornyakov

Брагута

et al. 2019

J. High Energ. Phys.

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In this paper we study the interactions among a static quark-antiquark pair in the presence of dense two-color quark matter with lattice simulation. To this end we compute Polyakov line correlation functions and determine the renormalized color averaged, color singlet and color triplet grand potentials. The color singlet grand potential allows us to elucidate the number of quarks induced by a static quark antiquark source, as well as the internal energy of such a pair in dense quark matter. We furthermore determine the screening length, which in the confinement phase is synonymous with the string breaking distance. The screening length is a decreasing function of baryon density, due to the possibility to break the interquark string via a scalar diquark condensate at high density. We also study the large distance properties of the color singlet grand potential in a dense medium and find that it is well described by a simple Debye screening formula, parameterized by a Debye mass and an effective coupling constant. The latter is of order of unity, i.e. even at large density two-color quark matter is a strongly correlated system.

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Section: Simulation Detailsmentioning

confidence: 99%

“…At sufficiently large baryon density (µ ∼ 1000 MeV, aµ ∼ 0.22) some observables of the system under study can be described using Bardeen-Cooper-Schrieffer theory (BCS phase) 1 . In particular, the baryon density is well described by the density of noninteracting fermions which occupy a Fermi sphere of radius r F = µ.…”

Section: Temperaturesmentioning

confidence: 99%

Lattice study of static quark-antiquark interactions in dense quark matter

Astrakhantsev

Bornyakov

Брагута

et al. 2019

J. High Energ. Phys.

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“…Their findings converge to the by now commonly accepted understanding that along the µ B = 0 line no genuine phase transition occurs. A crossover takes place around T ∼ 155 MeV in a T interval of roughly 20 MeV [14], [15], for recent reports see [16], [17] . This value of T decreased substantially as compared to the quoted value one decade ago, T = 192 MeV [18], that used calculations with improved staggered fermions for various light to strange quark mass ratios in the range [0.05, 0.5], and with a strange quark mass fixed close to its physical value (although with an estimate for the string tension 10% larger than the usually quoted), while in [19] the crossover temperature was reported to be close to the present day value for the renormalized chiral susceptibility and about 25 MeV larger for the strange quark number susceptibility and Polyakov loops, using physical quark mass values.…”

Section: Introductionmentioning

confidence: 95%

Thermodynamical properties of strongly interacting matter in a model with explicit chiral symmetry breaking interactions

et al. 2018

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We analyse the effects of the light and strange current quark masses on the phase diagram of QCD at finite temperature and vanishing baryonic chemical potential, computing the speed of sound, the trace anomaly of the energy momentum tensor and the fluctuations and correlations of the conserved charges associated to baryonic, electric and strangeness numbers. The framework is a known extension of the three flavor Nambu Jona Lasinio model, which includes the full set of explicit chiral symmetry breaking interactions (ESB) up to the same order in large Nc counting as the 't Hooft flavor mixing terms and eight quark interactions. It is shown that the ESB terms are relevant for the description of a soft region in the system's speed of sound and overall slope behavior of the observables computed. At the same time the role of the 8q interactions gets highlighted. The model extension with the Polyakov loop is considered and the results are compared to lattice QCD data.We take only the dominant contributions to the heat kernel series, up to b 1 , b 2 for meson spectra and decays, which involve the logarithmically I 1 and quadratically I 0 divergent integrals in Λ.The J −1 integral is obtained as [82]

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“…One might be wondering why we do not touch the lattice-QCD results in this review. This is because there are already thorough reviews by the authors from lattice-QCD groups [17] including recent proceedings [18,19]. In this review, we pay more of our attention to semi-analytical sides of the Polyakov loop physics, particularly about the theoretical formulations of deconfinement in the pure gluonic theory as addressed in Sec.…”

Section: Introductionmentioning

confidence: 99%

Polyakov loop modeling for hot QCD

Fukushima

Skokov

2017

Progress in Particle and Nuclear Physics

115

119

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We review theoretical aspects of quantum chromodynamics (QCD) at finite temperature. The most important physical variable to characterize hot QCD is the Polyakov loop, which is an approximate order parameter for quark deconfinement in a hot gluonic medium. Additionally to its role as an order parameter, the Polyakov loop has rich physical contents in both perturbative and non-perturbative sectors. This review covers a wide range of subjects associated with the Polyakov loop from topological defects in hot QCD to model building with coupling to the Polyakov loop.Comment: 72 pages, 29 figures; more references added on request; published in Progress in Particle and Nuclear Physic

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Frontiers of finite temperature lattice QCD

Cited by 20 publications

References 98 publications

Lattice study of static quark-antiquark interactions in dense quark matter

Lattice study of static quark-antiquark interactions in dense quark matter

Thermodynamical properties of strongly interacting matter in a model with explicit chiral symmetry breaking interactions

Polyakov loop modeling for hot QCD

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