Speed of sound in the QGP and an SU(3) Yang-Mills theory

Khaidukov, Z. V.; Lukashov, M. S.; Simonov, Yu. A.

doi:10.1103/physrevd.98.074031

Cited by 15 publications

(8 citation statements)

References 88 publications

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“…We extended our results to rather high temperatures , just because we wanted to test our basic principles 3. The same is true for the speed of sound in gluodynamics[67].…”

mentioning

confidence: 96%

Thermodynamics of a quark-gluon plasma at finite baryon density

Khaidukov

Simonov

2019

Phys. Rev. D

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Properties of the quark-gluon plasma(QGP) in the presence of the baryon chemical potential µ B are studied using the Field Correlator Method(FCM). The nonperturbative FCM dynamics includes the Polyakov line, computed via colorelectric string tension σ E (T ) and the quark and gluon Debye masses, defined by the colormagnetic string tension σ H (T ). The resulting QGP thermodynamics at µ B ≤ 400 MeV is in a good agreement with the available lattice data,both pressure and the sound velocity do not show any sign of a critical behavior in this region.

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“…We extended our results to rather high temperatures , just because we wanted to test our basic principles 3. The same is true for the speed of sound in gluodynamics[67].…”

mentioning

confidence: 96%

Thermodynamics of a quark-gluon plasma at finite baryon density

Khaidukov

Simonov

2019

Phys. Rev. D

Self Cite

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“…It can be seen from the above the speed of sound is a fundamental property of strongly interacting matter. Some calculations of sound velocity in QCD matter have been performed in LQCD [1,5,7,8,46], (P)NJL model [28,[47][48][49][50][51], quark-meson coupling model [15,57], hadron resonance gas (HRG) model [52,53], field correlator method (FCM) [54,55] and quasiparticle model [56]. By far, the main focus is put on the region of high tem-perature and zero or small chemical potential.…”

Section: Introductionmentioning

confidence: 99%

Speed of sound in QCD matter

He,

Shao,

Gao

et al. 2022

Preprint

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We systematically investigate the speed of sound in QCD matter under different conditions in the grand canonical ensemble within the Polyakov loop improved Nambu-Jona-Lasinio (PNJL) model. The numerical results indicate that the dependence of speed of sound on parameters like temperature and chemical potential can be indicative of QCD phase transition. Some new features of speed of sound are discovered, for instance, the hierarchy of sound velocity for u(d) and s quark at low temperature with the increasing chemical potential and the squared sound velocity approaching to almost zero in the critical region. We also formulate the relations between differently defined sound velocity using the fundamental thermodynamic relations. Some conclusions derived are useful for hydrodynamics simulation and calculation of transport coefficient of bulk viscosity.

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“…There are two possible ways to solve the tension between the existence of massive stars (from astrophysical data) and the theoretical expectations to recover the high density conformal limit: i) there is some physical mechanism which is responsible for a rapid increase of c s at densities close to twice saturation density and which then "switches off" at larger densities allowing to recover the conformal limit from above. There are several examples in the literature for this kind of explanation, see [7,[13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Speed of sound in dense matter and two families of compact stars

Traversi,

Char,

Pagliara

et al. 2021

Preprint

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We investigate the possibility of having massive compact stars, (M > 2M ), and at the same time fulfilling the theoretical bounds on the speed of sound cs in dense matter suggesting that the conformal limit of c 2 s = 1/3 is approached from below as the density increases. This is possible if two families of stars exist: hadronic stars and quark stars, the latter being entirely composed by quark matter. By using astrophysical data on electromagnetic and gravitational waves signals of a few sources interpreted as quark stars, we show, within a Bayesian analysis framework, that the posterior distribution of c 2 s is peaked around 0.3, and the maximum mass of the most probable equation of state is ∼ 2.13M . We finally discuss also the possibility that the maximum mass is larger than 2.6M as it could be the case if the secondary component of GW190814 is a compact star and not a black hole.

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Speed of sound in the QGP and an SU(3) Yang-Mills theory

Cited by 15 publications

References 88 publications

Thermodynamics of a quark-gluon plasma at finite baryon density

Thermodynamics of a quark-gluon plasma at finite baryon density

Speed of sound in QCD matter

Speed of sound in dense matter and two families of compact stars

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