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The uncertainties in neutron star (NS) radii and crust properties due to our limited knowledge of the equation of state (EOS) are quantitatively analysed. We first demonstrate the importance of a unified microscopic description for the…

Solar and Stellar Astrophysics · Physics 2016-10-12 M. Fortin , C. Providencia , A. R. Raduta , F. Gulminelli , J. L Zdunik , P. Haensel , M. Bejger

A central open problem in nuclear physics is the determination of a physically robust equation of state (EoS) for dense nuclear matter, which directly informs our understanding of the internal composition and macroscopic properties of…

Nuclear Theory · Physics 2025-12-08 I. Stergakis , Th. Diakonidis , Ch. C. Moustakidis

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

Binary neutron star mergers provide a unique laboratory for studying matter under conditions that cannot be reproduced in terrestrial experiments. They probe dense matter at supranuclear density, finite temperature, rapid rotation, strong…

High Energy Astrophysical Phenomena · Physics 2026-05-27 Armen Sedrakian

In this article we study the structure and stability of compact astrophysical objects which are ruled by the dark energy equation of state (EoS). The existence of dark energy is important for explaining the current accelerated expansion of…

General Relativity and Quantum Cosmology · Physics 2021-08-02 Ayan Banerjee , M. K. Jasim , Anirudh Pradhan

Nuclear equation of state (EoS) plays an important role in understanding the formation of compact objects such as neutron stars and black holes. The true nature of the EoS has been a matter of debate at any density range not only in the…

Understanding the equation of state (EOS) of cold nuclear matter, namely, the relation between the pressure and energy density, is a central goal of nuclear physics that cuts across a variety of disciplines. Indeed, the limits of nuclear…

Nuclear Theory · Physics 2009-06-12 J. Piekarewicz

The Equation of State (EOS) of dense strongly-interacting matter can be probed by astrophysical observations of neutron stars (NS), such as X-ray detections of pulsars or the measurement of the tidal deformability of NSs during the inspiral…

High Energy Astrophysical Phenomena · Physics 2023-11-09 Maximiliano Ujevic , Rahul Somasundaram , Tim Dietrich , Jerome Margueron , Ingo Tews

Understanding how matter behaves at the highest densities and temperatures is a major open problem in both nuclear physics and relativistic astrophysics. This physics is often encapsulated in the so-called high-temperature nuclear equation…

High Energy Astrophysical Phenomena · Physics 2022-06-22 Mikhail M. Meskhi , Noah E. Wolfe , Zhenyu Dai , Carla Frohlich , Jonah M. Miller , Raymond K. W. Wong , Ricardo Vilalta

The difficulty in describing the equation of state (EoS) for nuclear matter at densities above the saturation density ($\rho_0$) has led to the emergence of a multitude of models based on different assumptions and techniques. These EoSs,…

Nuclear Theory · Physics 2024-01-17 Ameya Thete , Kinjal Banerjee , Tuhin Malik

We calculate total masses and radii of neutron stars (NS) for pure neutron matter and nuclear matter in beta-equilibrium. We apply a relativistic nuclear matter equation of state (EOS) derived from Dirac-Brueckner-Hartree-Fock (DBHF)…

Nuclear Theory · Physics 2009-11-11 Plamen G. Krastev , Francesca Sammarruca

Nuclear reactions induced by high energy radioactive beams create a transient state of nuclear matter with high density and appreciable neutron to proton asymmetry. This will provide a unique opportunity to explore novel properties of dense…

Nuclear Theory · Physics 2015-06-26 Bao-An Li

Numerous models of neutron star (NS) equation of state (EoS) exist based on different superdense-matter physics approaches. Nevertheless, some NS properties show universal (EoS-independent) relations. Here, we propose a novel class of such…

High Energy Astrophysical Phenomena · Physics 2024-08-02 Dmitry D. Ofengeim , Peter S. Shternin , Tsvi Piran

We present an updated general purpose nuclear equation of state (EoS) for use in simulations of core-collapse supernovae, neutron star mergers and black hole collapse. This EoS is formulated in the context of Density Functional Theory (DFT)…

We explore constraints on the equation of state (EOS) of neutron-rich matter based on microscopic calculations up to nuclear densities and observations of neutron stars. In a previous work we showed that predictions based on modern nuclear…

High Energy Astrophysical Phenomena · Physics 2020-10-08 S. K. Greif , K. Hebeler , J. M. Lattimer , C. J. Pethick , A. Schwenk

We investigate the equation of state (EOS) and macroscopic properties of neutron stars (NSs) and hyperonic stars within the framework of the lowest order constrained variational (LOCV) method, extended to include interacting $\Lambda$…

Nuclear Theory · Physics 2026-01-21 Ali Mohammad Ali Looee , Mahboubeh Shahrbaf , Hamid Reza Moshfegh

The aim of our work is to develop a unified equation of state (EoS) for nuclear and quark matter for a wide range in temperature, density and isospin so that it becomes applicable for heavy-ion collisions as well as for the astrophysics of…

Nuclear Theory · Physics 2016-03-23 N. -U. Bastian , D. Blaschke

The equation of state (EOS) of extremely dense matter is crucial for understanding the properties of rotating neutron stars. Starting from the widely used realistic Bonn potentials rooted in a relativistic framework, we derive EOSs by…

Nuclear Theory · Physics 2025-08-06 Xiaoying Qu , Sibo Wang , Hui Tong

The half-skyrmions that appear in dense baryonic matter when skyrmions are put on crystals modify drastically hadron properties in dense medium and affect strongly the nuclear tensor forces, thereby influencing the equation of state (EoS)…

Nuclear Theory · Physics 2015-06-05 Huan Dong , T. T. S. Kuo , Hyun Kyu Lee , R. Machleidt , Mannque Rho

We study the equation of state (EoS) of a neutron star (NS) accounting for new advances. In the low energy density, $n\leq 0.1 n_s$, with $n_s$ the saturation density, we use a new pure neutron matter EoS that is regulator independent and…

Nuclear Theory · Physics 2024-10-22 J. M. Alarcón , E. Lope-Oter , J. A. Oller