Probing deconfinement in a chiral effective model with Polyakov loop at imaginary chemical potential

Morita, Kenji; Skokov, Vladimir V.; Friman, Bengt; Redlich, K.

doi:10.1103/physrevd.84.076009

Cited by 32 publications

(27 citation statements)

References 71 publications

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“…The QCD phase structure has also been investigated for imaginary chemical potentials in ref. [86][87][88] under PNJL model framework. Different interesting features of the Polyakov loop have instigated the development of different formalisms of the PNJL model [89][90][91][92].…”

Section: Introductionmentioning

confidence: 99%

Reparametrizing the Polyakov–Nambu–Jona-Lasinio model

et al. 2017

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The Polyakov−Nambu−Jona-Lasinio model has been quite successful in describing various qualitative features of observables for strongly interacting matter, that are measurable in heavy-ion collision experiments. The question still remains on the quantitative uncertainties in the model results. Such an estimation is possible only by contrasting these results with those obtained from first principles using the lattice QCD framework. Recently a variety of lattice QCD data were reported in the realistic continuum limit. Here we make a first attempt at reparametrizing the model so as to reproduce these lattice data. We find excellent quantitative agreement for the equation of state. Certain discrepancies in the charge and strangeness susceptibilities as well as baryon-charge correlation still remain. We discuss their causes and outline possible directions to remove them.

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Section: Introductionmentioning

confidence: 99%

Reparametrizing the Polyakov–Nambu–Jona-Lasinio model

et al. 2017

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“…ii) Early studies have shown that the RW endpoint transition is first order for small quark masses, second order for intermediate masses, and again first order for large masses; the three regions are separated by two tricritical points [13][14][15]. The emergence of this interesting structure has induced many further studies in effective models [28][29][30][31][32][33][34][35][36][37][38][39][40] which try to reproduce the essential features of QCD. Moreover, interesting proposals have been made on the connection of this phase structure with that present at µ B = 0 (the so-called Columbia plot) and on the possibility to exploit the whole phase structure at imaginary chemical potential in order to clarify currently open issues on the phase structure at µ B = 0, like the order of the chiral transition for N f = 2 [21,24].…”

Section: Introductionmentioning

confidence: 99%

Roberge-Weiss endpoint at the physical point ofNf=2+1QCD

Bonati¹,

D’Elia²,

Mariti³

et al. 2016

Phys. Rev. D

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We study the phase diagram of N f = 2 + 1 QCD in the T − µB plane and investigate the critical point corresponding to the onset of the Roberge-Weiss transition, which is found for imaginary values of µB. We make use of stout improved staggered fermions and of the tree level Symanzik gauge action, and explore four different sets of lattice spacings, corresponding to Nt = 4, 6, 8, 10, and different spatial sizes, in order to assess the universality class of the critical point. The continuum extrapolated value of the endpoint temperature is found to be TRW = 208(5) MeV, i.e. TRW/Tc ∼ 1.34 (7), where Tc is the chiral pseudocritical temperature at zero chemical potential, while our finite size scaling analysis, performed on Nt = 4 and Nt = 6 lattices, provides evidence for a critical point in the 3d Ising universality class.

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“…Results have first been obtained within a staggered fermion formulation of QCD, but efforts have been undertaken to confirm their universality also within a Wilson fermion approach [35,[37][38][39] leading to the same qualitative phase diagram [35]. The Roberge-Weiss endpoint transition, or variants of it, also has been studied in many other different contexts and QCD-like theories [40][41][42][43][44][45][46][47][48][49][50][51].…”

Section: Phase Diagram For Imaginary Chemical Potentialmentioning

confidence: 99%

Chiral phase transition in two-flavor QCD from an imaginary chemical potential

et al. 2014

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We investigate the order of the finite temperature chiral symmetry restoration transition for QCD with two massless fermions, by using a novel method, based on simulating imaginary values of the quark chemical potential μ ¼ iμ i , μ i ∈ R. Our method exploits the fact that, for low enough quark mass m and large enough chemical potential μ i , the chiral transition is decidedly first order, then turning into crossover at a critical mass m c ðμÞ. It is thus possible to determine the critical line in the m − μ 2 plane, which can be safely extrapolated to the chiral limit by taking advantage of the known tricritical indices governing its shape. We test this method with standard staggered fermions and the result of our simulations is that m c ðμ ¼ 0Þ is positive, so that the phase transition at zero density is definitely first order in the chiral limit, on our coarse N t ¼ 4 lattices with a ≃ 0.3 fm.

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Probing deconfinement in a chiral effective model with Polyakov loop at imaginary chemical potential

Cited by 32 publications

References 71 publications

Reparametrizing the Polyakov–Nambu–Jona-Lasinio model

Reparametrizing the Polyakov–Nambu–Jona-Lasinio model

Roberge-Weiss endpoint at the physical point ofNf=2+1QCD

Chiral phase transition in two-flavor QCD from an imaginary chemical potential

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