On Manifestation of In-Medium Effects in Neutron Stars and Heavy-Ion Collisions

Voskresensky, D. N.

doi:10.3390/universe4020028

Cited by 6 publications

(3 citation statements)

References 90 publications

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“…In particular, in the medium-modified OPE (MOPE) model of [524][525][526][527] one asserts that the emissivity receives a strong and dominant density-dependent correction due to the softening of the pion mode (reduction of the in-medium pion mass). Then at ρ > ρ 0 , diagrams of type Fig.…”

Section: Modified Urcamentioning

confidence: 99%

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Neutron Stars and the Nuclear Equation of State

Burgio,

Vidana,

Schulze

et al. 2021

Preprint

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We review the current status and recent progress of microscopic many-body approaches and phenomenological models, which are employed to construct the equation of state of neutron stars. The equation of state is relevant for the description of their structure and dynamical properties, and it rules also the dynamics of core-collapse supernovae and binary neutron star mergers. We describe neutron star matter assuming that the main degrees of freedom are nucleons and hyperons, disregarding the appearance of quark matter. We compare the theoretical predictions of the different equation-of-state models with the currently available data coming from both terrestrial laboratory experiments and recent astrophysical observations. We also analyse the importance of the nuclear strong interaction and equation of state for the cooling properties of neutron stars. We discuss the main open challenges in the description of the equation of state, mainly focusing on the limits of the different many-body techniques, the so-called "hyperon puzzle," and the dependence of the direct URCA processes on the equation of state.

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Section: Modified Urcamentioning

confidence: 99%

“…7.5.3, the standard cooling rates disregard various in-medium effects. The authors of the "nuclear medium cooling" approach [511,[526][527][528]532] advocate very strong modifications of the different cooling processes, in particular a strong density-dependent enhancement of the MU and BS reactions, Eqs. (81,87).…”

Section: Medium-modified Urca Processesmentioning

confidence: 99%

Neutron Stars and the Nuclear Equation of State

Burgio,

Vidana,

Schulze

et al. 2021

Preprint

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“…The important role of the p-wave pion-baryon and kaon-baryon interactions has been intensively studied in the literature, cf. [26,49,50,[103][104][105][106] and refs. therein.…”

Section: Appendixmentioning

confidence: 99%

RMF models with $\sigma$-scaled hadron masses and couplings for the description of heavy-ion collisions below 2 A GeV

Maslov¹,

Voskresensky²

2019

Eur. Phys. J. A

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Within the relativistic mean-field framework with hadron masses and coupling constants dependent on the mean scalar field we study properties of nuclear matter at finite temperatures, baryon densities and isospin asymmetries relevant for heavy-ion collisions at laboratory energies below 2A GeV. Previously constructed (KVORcut-based and MKVOR-based) models for the description of the cold hadron matter, which differ mainly by the density dependence of the nucleon effective mass and symmetry energy, are extended for finite temperatures. The baryon equation of state, which includes nucleons and ∆ resonances is supplemented by the contribution of the pion gas described either by the vacuum dispersion relation or with taking into account the s-wave pion-baryon interaction. Distribution of the charge between components is found. Thermodynamical characteristics on T − n plane are considered. The energy-density and entropy-density isotherms are constructed and a dynamical trajectory of the hadron system formed in heavy-ion collisions is described. The effects of taking into account the ∆ isobars and the s-wave pionnucleon interaction on pion differential cross sections, pion to proton and π − /π + ratios are studied. The liquid-gas first-order phase transition is studied within the same models in isospin-symmetric and asymmetric systems. We demonstrate that our models yield thermodynamic characteristics of the phase transition compatible with available experimental results. In addition, we discuss the scaled variance of baryon and electric charge in the phase transition region. Effect of the non-zero surface tension on spatial redistribution of the electric charge is considered for a possible application to heavy-ion collisions at low energies.

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