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A new scheme for testing the nuclear matter (NM) equation of state (EoS) at high densities using constraints from compact star (CS) phenomenology is applied to neutron stars with a core of deconfined quark matter (QM). An acceptable EoS…

Astrophysics · Physics 2007-05-23 H. Grigorian , D. Blaschke , T. Klaehn

Neutron stars are the dense and highly magnetic relics of supernova explosions of massive stars. The quest to constrain the Equation of State (EoS) of ultra-dense matter and thereby probe the behavior of matter inside neutron stars, is one…

High Energy Astrophysical Phenomena · Physics 2024-04-09 Alessio Marino , Clara Dehman , Konstantinos Kovlakas , Nanda Rea , Jose A. Pons , D. Viganò

We discuss the relativistic nuclear equation of state (EOS) using a relativistic transport model in heavy-ion collisions. From the baryon flow for $Au + Au$ systems at SIS to AGS energies and above we find that the strength of the vector…

Nuclear Theory · Physics 2009-11-06 P. K. Sahu

The general behavior of the nuclear equation of state (EOS), relevant for the description of neutron stars (NS), is studied within a relativistic mean field description of nuclear matter. Different formulations, both with density dependent…

Nuclear Theory · Physics 2024-06-06 Constança Providência , Tuhin Malik , Milena Bastos Albino , Márcio Ferreira

We study the equation of state (EOS) of nuclear matter as function of density. We expand the energy per particle (E/A) of symmetric infinite nuclear matter in powers of the density to take into account 2,3,. . .,N-body forces. New EOS are…

Nuclear Theory · Physics 2015-05-19 Ruslan Magana , Hua Zhenga , Aldo Bonasera

Analytical representations are derived for two equations of state (EOSs) of neutron-star matter: FPS and SLy. Each of these EOSs is unified, that is, it describes the crust and the core of a neutron star using the same physical model. Two…

Astrophysics · Physics 2007-05-23 P. Haensel , A. Y. Potekhin

In astrophysics as well as in hadron physics progress has recently been made on the determination of the hadronic equation of state (EOS) of compressed matter. The results are contradictory, however. Simulations of heavy ion reactions are…

Nuclear Theory · Physics 2009-11-11 Ch. Hartnack , H. Oeschler , Jörg Aichelin

Crystal lattice structure is present in stellar compact objects, such as white dwarf stars and in the crust of neutron stars. These structures can be described by a body-centered cubic crystal, which is formed by ions due to Coulombian…

Solar and Stellar Astrophysics · Physics 2022-12-20 S. V. C. Ramalho , S. B. Duarte , G. S. Vicente

The cold, dense matter equation of state (EoS) determines crucial global properties of neutron stars (NSs), including the mass, radius and tidal deformability. However, a one-dimensional (1D), cold, and $\beta$-equilibrated EoS is…

High Energy Astrophysical Phenomena · Physics 2025-12-10 Zhenyu Zhu , Shuai Zha , Sophia Han

Whether fast cooling processes occur or not is crucial for the thermal evolution of neutron stars. In particular, the threshold of the direct Urca process, which is one of the fast cooling processes, is determined by the interior proton…

High Energy Astrophysical Phenomena · Physics 2020-01-07 Akira Dohi , Ken'ichiro Nakazato , Masa-aki Hashimoto , Yasuhide Matsuo , Tsuneo Noda

The increasing number and precision of measurements of neutron star masses, radii, and, in the near future, moments of inertia offer the possibility of precisely determining the neutron star equation of state. One way to facilitate the…

High Energy Astrophysical Phenomena · Physics 2016-12-14 Carolyn A. Raithel , Feryal Özel , Dimitrios Psaltis

A proto-neutron star (PNS) gets formed after a successful supernova when the stellar remnant decouples from the ejecta. In this study, we explore a relativistic framework for the finite-temperature $\beta$-equilibrium limit of equation of…

Nuclear Theory · Physics 2025-05-27 Deepak Kumar , Tuhin Malik , Hiranmaya Mishra , Constança Providência

We calculate a new equation of state for baryons at sub-nuclear densities meant for the use in core-collapse simulations of massive stars. The abundance of various nuclei is obtained together with the thermodynamic quantities. The…

High Energy Astrophysical Phenomena · Physics 2015-05-27 Shun Furusawa , Shoichi Yamada , Kohsuke Sumiyoshi , Hideyuki Suzuki

In this work, we study the effect of strong magnetic fields on the equation of state (EoS) of warm, homogeneous, Neutron Star (NS) matter in beta equilibrium. NS matter is described within a relativistic mean field (RMF) approximation,…

Nuclear Theory · Physics 2024-07-04 Luigi Scurto , Valéria Carvalho , Helena Pais , Constança Providência

We construct the equation of state (EOS) of nuclear matter using the relativistic mean field (RMF) theory in the wide density, temperature range with various proton fractions for the use of supernova simulation and the neutron star…

Nuclear Theory · Physics 2009-10-31 H. Shen , H. Toki , K. Oyamatsu , K. Sumiyoshi

We study equation of state (EOS) of an accreting neutron star crust. Usually, such EOS is obtained assuming (implicitly) that the free (unbound) neutrons and nuclei in the inner crust move together. We argue, that this assumption violates…

High Energy Astrophysical Phenomena · Physics 2020-05-20 Mikhail E. Gusakov , Andrey I. Chugunov

Equation of state for partially ionized carbon at temperatures T > ~ 10^5 K is calculated in a wide range of densities, using the method of free energy minimization in the framework of the chemical picture of plasmas. The free energy model…

Plasma Physics · Physics 2007-05-23 A. Y. Potekhin , G. Massacrier , G. Chabrier

Equation of state (EOS) describes the thermodynamic properties of substances. It has important applications in many fields such as power mechanics, geophysics, astrophysics, and detonation physics. Currently, most EOSs have been constructed…

Statistical Mechanics · Physics 2021-07-15 Ti-Wei Xue , Zeng-Yuan Guo

We critically examine nuclear matter and neutron matter equation of state (EoS) parameters by using best available terrestrial experimental results. The nuclear incompression modulus $K_{\infty}$ is re-examined in comparisons with RPA…

Nuclear Theory · Physics 2019-09-04 H. Sagawa , S. Yoshida , Li-Gang Cao

The equation of state (EoS) of strongly interacting matter at finite temperature and chemical potentials (baryon, charge, and strangeness) is a crucial input for hydrodynamic simulations of relativistic heavy-ion collisions. We construct a…

Nuclear Theory · Physics 2026-04-27 Fu-Peng Li , Long-Gang Pang , Guang-You Qin