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We formulate the equations of equilibrium of neutron stars taking into account strong, weak, electromagnetic, and gravitational interactions within the framework of general relativity. The nuclear interactions are described by the exchange…

Solar and Stellar Astrophysics · Physics 2012-06-01 Riccardo Belvedere , Daniela Pugliese , Jorge A. Rueda , Remo Ruffini , She-Sheng Xue

In our previous treatment of neutron stars, we have developed the model fulfilling global and not local charge neutrality. In order to implement such a model, we have shown the essential role by the Thomas-Fermi equations, duly generalized…

Solar and Stellar Astrophysics · Physics 2014-11-13 R. Belvedere , K. Boshkayev , Jorge A. Rueda , R. Ruffini

We present the self-consistent treatment of the simplest, nontrivial, self-gravitating system of degenerate neutrons, protons and electrons in $\beta$-equilibrium within relativistic quantum statistics and the Einstein-Maxwell equations.…

General Relativity and Quantum Cosmology · Physics 2011-09-14 M. Rotondo , Jorge A. Rueda , R. Ruffini , S. -S. Xue

Globally neutral neutron stars, obtained from the solution of the called Einstein-Maxwell-Thomas-Fermi equations that account for all the fundamental interactions, have been recently introduced. These configurations have a more general…

High Energy Astrophysical Phenomena · Physics 2015-06-23 S. M. de Carvalho , R. Negreiros , Jorge A. Rueda , Remo Ruffini

We have recently proved the impossibility of imposing the condition of local charge neutrality in a self-gravitating system of degenerate neutrons, protons and electrons in $\beta$-equilibrium. The coupled system of the general relativistic…

Solar and Stellar Astrophysics · Physics 2011-07-15 Michael Rotondo , Jorge A. Rueda , Remo Ruffini , She-Sheng Xue

In this chapter we review the recent results on the equilibrium configurations of static and uniformly rotating neutron stars within the Hartle formalism. We start from the Einstein-Maxwell-Thomas-Fermi equations formulated and extended by…

High Energy Astrophysical Phenomena · Physics 2016-09-03 Kuantay Boshkayev

We have recently developed a neutron star model fulfilling global and not local charge neutrality, both in the static and in the uniformly rotating cases. The model is described by the coupled Einstein-Maxwell-Thomas- Fermi (EMTF)…

Solar and Stellar Astrophysics · Physics 2015-06-23 Riccardo Belvedere , Jorge Armando Rueda , Remo Ruffini

Recently, it has been suggested that a critical electrical field arises during the gravitational collapse of massive stars leading to a vacuum polarization. This, in turn, leads to the necessity of a reexamination of the…

Solar and Stellar Astrophysics · Physics 2013-08-19 Rodrigo Alvares de Souza , Marcio Guilherme Bronzato de Avellar , Jorge Ernesto Horvath

We present a unified treatment of nuclear density cores recovering the classic results for neutral atoms with heavy nuclei having a mass number $A\approx 10^2--10^6$ and extrapolating these results to massive nuclear density cores with…

Solar and Stellar Astrophysics · Physics 2009-03-24 Vladimir Popov , Michael Rotondo , Remo Ruffini , She-Sheng Xue

It has been shown recently that taking into account strong, weak, electromagnetic, and gravitational interactions, and fulfilling the global charge neutrality of the system, a transition layer will happen between the core and crust of…

Solar and Stellar Astrophysics · Physics 2014-03-20 Jorge A. Rueda , Remo Ruffini , Yuan-Bin Wu , She-Sheng Xue

General relativity guarantees a unique one-to-one correspondence between static observables of neutron stars (NSs) accessible by multi-messenger astronomy, such as mass-radius or tidal deformability, and the equation of state (EoS) of beta…

Nuclear Theory · Physics 2022-04-27 Chiranjib Mondal , Francesca Gulminelli

The equation of state for neutron stars in a wide-density range at zero temperature is constructed. The chiral quark-meson coupling model within relativistic Hartree-Fock approximation is adopted for uniform nuclear matter. The coupling…

High Energy Astrophysical Phenomena · Physics 2013-10-15 Tsuyoshi Miyatsu , Sachiko Yamamuro , Ken'ichiro Nakazato

In the present paper we study the singularity structure of the exterior field of neutron stars with the aid of the four-parameter exact solution of the Einstein-Maxwell equations. The complete analysis of this problem in the generic case…

General Relativity and Quantum Cosmology · Physics 2023-04-04 V. S. Manko , I. M. Mejía , C. I. Ramos , E. Ruiz

A general approach to analyze the electrodynamics of nuclear matter in bulk is presented using the relativistic Thomas-Fermi equation generalizing to the case of $N \simeq (m_{\rm Planck}/m_n)^3$ nucleons of mass $m_n$ the approach well…

Astrophysics · Physics 2008-11-26 Remo Ruffini , Michael Rotondo , She-Sheng Xue

We study the properties and stability of nuclei in the inner crust of neutron stars in the presence of strong magnetic fields $\sim 10^{17}$ G. Nuclei coexist with a neutron gas and reside in a uniform gas of electrons in the inner crust.…

High Energy Astrophysical Phenomena · Physics 2015-05-20 Rana Nandi , Debades Bandyopadhyay , Igor N. Mishustin , Walter Greiner

The cell structure of $\beta$-stable clusters in the inner crust of cold and warm neutron stars is studied within the Thomas-Fermi approach using relativistic mean field nuclear models. The relative size of the inner crust and the pasta…

The stability of the $\beta$-equilibrated dense nuclear matter is analyzed with respect to the thermodynamic stability conditions. Based on the density dependent M3Y effective nucleon-nucleon interaction, the effects of the nuclear…

Nuclear Theory · Physics 2014-09-05 Debasis Atta , D. N. Basu

We present a self-consistent, relativistic model of rapidly rotating neutron stars describing their exterior gravitational field. This is achieved by matching the new solution of Einstein's field equations found by Manko et al. (2000) and…

Astrophysics · Physics 2009-11-07 Matthias Stute , Max Camenzind

We provide new exact solutions to the Einstein-Maxwell system of equations which are physically reasonable. The spacetime is static and spherically symmetric with a charged matter distribution. We utilise an equation of state which is…

General Relativity and Quantum Cosmology · Physics 2015-06-12 S. D. Maharaj , P. Mafa Takisa

Stability of nuclei beyond the drip lines in the presence of an enveloping gas of nucleons and electrons, as prevailing in the inner crust of a neutron star, is studied in the temperature-dependent Thomas-Fermi framework. A limiting…

Nuclear Theory · Physics 2009-11-07 Tapas Sil , J. N. De , S. K. Samaddar , X. Vinas , M. Centelles , B. K. Agrawal , S. K. Patra
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