Repulsive properties of hadrons in lattice QCD data and neutron stars

Motornenko, Anton; Pal, Santinath; Bhattacharyya, Abhijit; Steinheimer, Jan; Stoecker, Horst

doi:10.1103/physrevc.103.054908

Cited by 17 publications

(10 citation statements)

References 86 publications

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“…The effective masses of the parity partners depend on the chiral fields, therefore the partners become mass-degenerate as the chiral symmetry is restored. A detailed description of the CMF model with its parameters can be found in [63].…”

Section: Equations Of Statementioning

confidence: 99%

A chiral mean-field equation-of-state in UrQMD: effects on the heavy ion compression stage

et al. 2022

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It is shown that the initial compression in central heavy ion collisions at beam energies of $$E_{\mathrm {lab}}=1-10A$$ E lab = 1 - 10 A GeV depends dominantly on the underlying equation of state and only marginally on the model used for the dynamical description. To do so, a procedure to incorporate any equation of state in the UrQMD transport model is introduced. In particular we compare the baryon density, temperature and pressure evolution as well as produced entropy in a relativistic ideal hydrodynamics approach and the UrQMD transport model, where the same equation of state is used in both approaches. Not only is the compression similar if the same equation of state is used in either dynamical model, but it also strongly depends on the actual equation of state. These results indicate that the equation of state can be studied with observables which are sensitive to the initial compression phase and maximum compression achieved in heavy ion collisions at these beam energies.

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Section: Equations Of Statementioning

confidence: 99%

A chiral mean-field equation-of-state in UrQMD: effects on the heavy ion compression stage

et al. 2022

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“…The baryons and their parity partners interact via mesonic mean fields (attractive scalar σ, ζ and repulsive ω, ρ, φ meson exchanges) and the effective masses of the parity partners become degenerate as chiral symmetry is restored. A detailed description of the CMF model and its parameters can be found in [69].…”

Section: The Cmf Modelmentioning

confidence: 99%

“…The CMF model describes many aspects of QCD phenomenology. It has been successfully applied in an analysis of lattice QCD data [69], used in the description of cold neutron stars [66], and has been employed as the EoS in hydrodynamic simulations of both heavy-ion collisions and binary neutron star mergers [70,71].…”

Section: The Cmf Modelmentioning

confidence: 99%

The high-density equation of state in heavy-ion collisions: constraints from proton flow

et al. 2022

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A set of different equations of state is implemented in the molecular dynamics part of a non-equilibrium transport simulation (UrQMD) of heavy-ion collisions. It is shown how different flow observables are affected by the density dependence of the equation of state. In particular, the effects of a phase transition at high density are explored, including an expected reduction in mean $$m_T$$ m T . We also show that an increase in $$v_2$$ v 2 is characteristic for a strong softening of the equation of state. The phase transitions with a low coexistence density, $$n_{\text {CE}}<4 n_0$$ n CE < 4 n 0 , show a distinct minimum in the slope of the directed flow as a function of the beam energy, which would be a clear experimental signal. By comparing our results with experimental data, we can exclude any strong phase transition at densities below $$4n_0$$ 4 n 0 .

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“…The smooth nature of the crossover from hadrons to quarks does not lead to a third family branch of compact stars. All these components allow the CMF model to be applied for modeling of heavy-ion collisions (Steinheimer et al 2010;Omana Kuttan et al 2022), analysis of lattice QCD data , 2014Motornenko et al 2020Motornenko et al , 2021aMotornenko et al 2021b), as well as studies of cold neutron stars and their mergers (Most et al 2022). Since the CMF EoS does not include heavy nuclei at sub-saturation density, we extend it to low densities using the SFHx EoS (Steiner et al 2013), which is matched to the CMF table at densities less than 8 × 10 13 g cm −3 .…”

Section: Cmf Eosmentioning

confidence: 99%

The Role of the Hadron-Quark Phase Transition in Core-Collapse Supernovae

Jakobus,

Mueller,

Heger

et al. 2022

Preprint

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The hadron-quark phase transition in quantum chromodyanmics has been suggested as an alternative explosion mechanism for core-collapse supernovae. We study the impact of three different hadron-quark equations of state (EoS) with first-order (DD2F, STOF-B145) and second-order (CMF) phase transitions on supernova dynamics by performing 97 simulations for solarand zero-metallicity progenitors in the range of 14-100 M . We find explosions only for two low-compactness models (14M and 16 M ) with the DD2F EoS, both with low explosion energies of ∼10 50 erg. These weak explosions are characterised by a neutrino signal with several mini-bursts in the explosion phase due to complex reverse shock dynamics, in addition to the typical second neutrino burst for phase-transition driven explosions. The nucleosynthesis shows significant overproduction of nuclei such as 90 Zr for the 14 M zero-metallicity model and 94 Zr for the 16 M solar-metallicity model, but the overproduction factors are not large enough to place constraints on the occurrence of such explosions. Several other low-compactness models using the DD2F EoS and two high-compactness models using the STOS EoS end up as failed explosions and emit a second neutrino burst. For the CMF EoS, the phase transition never leads to a second bounce and explosion. For all three EoS, inverted convection occurs deep in the core of the proto-compact star due to anomalous behaviour of thermodynamic derivatives in the mixed phase, which heats the core to entropies up to 4𝑘 B /baryon and may have a distinctive gravitational wave signature, also for a second-order phase transition.

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Repulsive properties of hadrons in lattice QCD data and neutron stars

Cited by 17 publications

References 86 publications

A chiral mean-field equation-of-state in UrQMD: effects on the heavy ion compression stage

A chiral mean-field equation-of-state in UrQMD: effects on the heavy ion compression stage

The high-density equation of state in heavy-ion collisions: constraints from proton flow

The Role of the Hadron-Quark Phase Transition in Core-Collapse Supernovae

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