2+1 flavors QCD equation of state at zero temperature within Dyson–Schwinger equations

Xu, Shu-Sheng; Yan, Yan; Cui, Zhu-Fang; Zong, Hong-Shi

doi:10.1142/s0217751x15502176

Cited by 16 publications

(13 citation statements)

References 74 publications

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“…On the other hand, the physics of neutron stars is also one of the central areas of research in nuclear astrophysics. In literature of neutron star studies, the crossover behavior in the hadron quark transition are also discussed, see for example, refs 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , which can explain some of the neutron star properties well, like the mass-radii relations.…”

Section: Resultsmentioning

confidence: 99%

Proper time regularization and the QCD chiral phase transition

Cui

Zhang

Zong

2017

Sci Rep

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We study the QCD chiral phase transition at finite temperature and finite quark chemical potential within the two flavor Nambu–Jona-Lasinio (NJL) model, where a generalization of the proper-time regularization scheme is motivated and implemented. We find that in the chiral limit the whole transition line in the phase diagram is of second order, whereas for finite quark masses a crossover is observed. Moreover, if we take into account the influence of quark condensate to the coupling strength (which also provides a possible way of how the effective coupling varies with temperature and quark chemical potential), it is found that a CEP may appear. These findings differ substantially from other NJL results which use alternative regularization schemes, some explanation and discussion are given at the end. This indicates that the regularization scheme can have a dramatic impact on the study of the QCD phase transition within the NJL model.

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Section: Resultsmentioning

confidence: 99%

Proper time regularization and the QCD chiral phase transition

Cui

Zhang

Zong

2017

Sci Rep

Self Cite

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“…Finally we summarise results for the quark number susceptibilities and fluctuations, obtained in the model set-up of Ref. [295] (see also [291]) and shown in Fig.4.13. These have been determined with the same chemical potential for both light quarks, i.e.…”

Section: Thermodynamics and Quark Number Susceptibilitiesmentioning

confidence: 97%

“…In Refs. [291,292] this interaction has been used together with m g = 0 (i.e. D T = D L ), and constant D(T, µ) = D. In Ref.…”

Section: Rainbow-ladder and Beyond Rainbow-ladder Truncations Using Amentioning

confidence: 99%

“…Together with the models for the gluon propagator, three different truncations for the quark-gluon vertex have been used and in some publications directly compared. These are either the bare vertex [287,291,[293][294][295] Γ µ = γ µ (3.55) or a Ball-Chiu construction generalised to finite temperature and chemical potential given by [287,288]. In [292] the Ball-Chiu vertex was even supplemented by a construction for the transverse parts of the vertex that has been taken from the vacuum physics studies of Ref.…”

Section: Rainbow-ladder and Beyond Rainbow-ladder Truncations Using Amentioning

confidence: 99%

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QCD at finite temperature and chemical potential from Dyson–Schwinger equations

Fischer

2019

Progress in Particle and Nuclear Physics

265

236

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We review results for the phase diagram of QCD, the properties of quarks and gluons and the resulting properties of strongly interacting matter at finite temperature and chemical potential. The interplay of two different but related transitions in QCD, chiral symmetry restoration and deconfinement, leads to a rich phenomenology when external parameters such as quark masses, volume, temperature and chemical potential are varied. We discuss the progress in this field from a theoretical perspective, focusing on non-perturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations. We aim at a pedagogical overview on the physics associated with the structure of this framework and explain connections to other approaches, in particular with the functional renormalization group and lattice QCD. We discuss various aspects associated with the variation of the quark masses, assess recent results for the QCD phase diagram including the location of a putative critical end-point for N f = 2 + 1 and N f = 2 + 1 + 1, discuss results for quark spectral functions and summarise aspects of QCD thermodynamics and fluctuations.

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“…To this end we solve a set of truncated Dyson-Schwinger equations. In contrast to previous works on fluctuations in the DSE framework [57,66] we take the back reaction of the quarks onto the Yang-Mills sector explicitly into account. This establishes a temperature and chemical potential dependence of the gluon controlled by QCD dynamics rather than simple modelling.…”

Section: Dyson-schwinger Equationsmentioning

confidence: 99%

Baryon number fluctuations in the QCD phase diagram from Dyson-Schwinger equations

et al. 2019

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We present results for fluctuations of the baryon number for QCD at non-zero temperature and chemical potential. These are extracted from solutions to a coupled set of truncated Dyson-Schwinger equations for the quark and gluon propagators of Landau gauge QCD with N f = 2 + 1 quark flavors, that has been studied previously. We discuss the changes of fluctuations and ratios thereof up to fourth order for several temperatures and baryon chemical potential up to and beyond the critical end point. In the context of preliminary STAR data for the skewness and kurtosis ratios, the results are compatible with the scenario of a critical end point at large chemical potential and slightly offset from the freeze-out line. We also discuss the caveats involved in this comparison.

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2+1 flavors QCD equation of state at zero temperature within Dyson–Schwinger equations

Cited by 16 publications

References 74 publications

Proper time regularization and the QCD chiral phase transition

Proper time regularization and the QCD chiral phase transition

QCD at finite temperature and chemical potential from Dyson–Schwinger equations

Baryon number fluctuations in the QCD phase diagram from Dyson-Schwinger equations

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