Relativistic mean-field model with scaled hadron masses and couplings

Khvorostukhin, A. S.; Тонеев, В.Д.; Voskresensky, D. N.

doi:10.1016/j.nuclphysa.2008.09.013

Cited by 22 publications

(46 citation statements)

References 70 publications

(158 reference statements)

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“…The SHMC model was successfully applied in Ref. [34,35,36,37] to description of various characteristics of heavy-ion collisions in a broad density-temperature region.…”

Section: Introductionmentioning

confidence: 99%

Relativistic mean-field models with scaled hadron masses and couplings: Hyperons and maximum neutron star mass

2016

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An equation of state of cold nuclear matter with an arbitrary isotopic composition is studied within a relativistic mean-field approach with hadron masses and coupling constants depending self-consistently on the scalar mean-field. All hadron masses decrease universally with the scalar field growth, whereas meson-nucleon coupling constants can vary differently. More specifically we focus on two modifications of the KVOR model studied previously. One extension of the model (KVORcut) demonstrates that the equation of state stiffens if the increase of the scalar-field magnitude with the density is bounded from above at some value for baryon densities above the saturation nuclear density. This can be realized if the nucleon vector-meson coupling constant changes rapidly as a function of the scalar field slightly above the desired value. The other version of the model (MKVOR) utilizes a smaller value of the nucleon effective mass at the nuclear saturation density and a saturation of the scalar field in the isospin asymmetric matter induced by a strong variation of the nucleon isovector-meson coupling constant as function of the scalar field. A possibility of hyperonization of the matter in neutron star interiors is incorporated. Our equations of state fulfill majority of known empirical constraints including the pressure-density constraint from heavy-ion collisions, direct Urca constraint, gravitational-baryon mass constraint for the pulsar J0737-3039B, and the constraint on the maximum mass of the neutron stars.

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“…The SHMC model was successfully applied in Ref. [34,35,36,37] to description of various characteristics of heavy-ion collisions in a broad density-temperature region.…”

Section: Introductionmentioning

confidence: 99%

Relativistic mean-field models with scaled hadron masses and couplings: Hyperons and maximum neutron star mass

2016

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“…Other common theoretical approaches to QCD are effective models to study specific properties of QCD matter [7,[34][35][36][37][38][39][40]. In our approach we will use an effective model for the QCD equation of state to study the properties of the phase diagram of nuclear matter.…”

Section: Introductionmentioning

confidence: 99%

Baryon resonances in a chiral hadronic model for the QCD equation of state

et al. 2012

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In this paper we study the influence of hadronic resonances on the phase diagram calculated with an effective chiral flavour SU(3) model. We show that varying the couplings of the baryonic resonances to the attractive scalar and the repulsive vector fields has a major impact on the order and location of the chiral phase transition and the possible existence of a critical end point as well as on the thermodynamic properties of the model. Furthermore, we study (strange) quark number fluctuations and show the related susceptibilities both at zero baryochemical potential and when crossing the phase transition line at three different points in the T-mu plane. We obtain the best agreement with current lattice data if we choose a rather strong vector coupling which in our model limits the phase transition to a smooth crossover and implies the non-existence of a critical end point

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“…Furthermore, the repulsive vector field is proportional to the net baryon density; therefore, standard RMF models do not appear, in principle, fully appropriate for very low-density and high-temperature regimes. In this context, let us observe that a phenomenological RMF model has been recently proposed to calculate the EOS of hadronic matter in a broad density-temperature region by considering masses and coupling constants depending on the σ -meson field [33]. In that approach, motivated by the Brown-Rho scaling hypothesis, a nonchiral symmetric model simulates a chiral symmetric restoration with a temperature increase.…”

Section: Introductionmentioning

confidence: 99%

Hot and dense hadronic matter in an effective mean-field approach

Lavagno

2010

Phys. Rev. C

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We investigate the equation of state of hadronic matter at finite values of baryon density and temperature reachable in high-energy heavy-ion collisions. The analysis is performed by requiring the Gibbs conditions on the global conservation of baryon number, electric charge fraction, and zero net strangeness. We consider an effective relativistic mean-field model with the inclusion of isobars, hyperons, and the lightest pseudoscalar and vector meson degrees of freedom. In this context, we study the influence of the -isobar degrees of freedom in the hadronic equation of state and, in connection, the behavior of different particle-antiparticle ratios and strangeness production. PACS number (s): 21.65.Mn, 25.75.−q 0556-2813/2010/81(4)/044909(13) 044909-1 A. LAVAGNO PHYSICAL REVIEW C 81, 044909 (2010) 044909-2 HOT AND DENSE HADRONIC MATTER IN AN EFFECTIVE . . . PHYSICAL REVIEW C 81, 044909 (2010)

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Relativistic mean-field model with scaled hadron masses and couplings

Cited by 22 publications

References 70 publications

Relativistic mean-field models with scaled hadron masses and couplings: Hyperons and maximum neutron star mass

Relativistic mean-field models with scaled hadron masses and couplings: Hyperons and maximum neutron star mass

Baryon resonances in a chiral hadronic model for the QCD equation of state

Hot and dense hadronic matter in an effective mean-field approach

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