Many-body Forces in Magnetic Neutron Stars

In this work, we study the effects of different magnetic field configurations in neutron stars described by a many-body forces formalism (MBF model). The MBF model is a relativistic mean field formalism that takes into account many-body forces by means of a meson field dependence of the nuclear interaction coupling constants. We choose the best parametrization of the model that reproduces nuclear matter properties at saturation and also describes massive neutron stars. We assume matter to be in beta-equilibrium, charge neutral and at zero temperature. Magnetic fields are taken into account both in the equation of state and in the structure of the stars by the self-consistent solution of the Einstein-Maxwell equations. We assume a poloidal magnetic field distribution and calculate its effects on neutron stars, showing its influence on the gravitational mass and deformation of the stars.

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Saturation of nuclear matter and roles of many-body forces: nuclear matter in neutron stars probed by nucleus—nucleus scattering

Progress of Theoretical and Experimental Physics ◽

10.1093/ptep/ptw072 ◽

2016 ◽

Vol 2016 (6) ◽

pp. 06A106 ◽

Cited By ~ 4

Author(s):

Yukinori Sakuragi

Keyword(s):

Neutron Stars ◽

Nuclear Matter ◽

Many Body ◽

Body Forces ◽

Nucleus Scattering

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A RELATIVISTIC EFFECTIVE MODEL WITH PARAMETERIZED COUPLINGS FOR NEUTRON STARS: THE ROLE OF ANTIKAON CONDENSATES

International Journal of Modern Physics E ◽

10.1142/s0218301311040700 ◽

2011 ◽

Vol 20 (supp02) ◽

pp. 133-139

Author(s):

ALEXANDRE MESQUITA ◽

MOISÉS RAZEIRA ◽

DIMITER HADJIMICHEF ◽

CÉSAR A. Z. VASCONCELLOS ◽

ROSANA O. GOMES ◽

...

Keyword(s):

Neutron Stars ◽

Coupling Constants ◽

Effective Model ◽

Extended Model ◽

Many Body ◽

Parametric Dependence ◽

Interaction Terms ◽

Coupling Terms ◽

Effective Models

We study the effects of antikaon condensates in neutron stars in the framework of a relativistic effective model with derivative couplings which includes genuine many-body forces simulated by nonlinear interaction terms involving scalar-isoscalar (σ, σ*), vector-isoscalar (ω, ɸ), vector-isovector (ϱ), scalar-isovector (δ) mesons. The effective model presented in this work has a philosophy quite similar to the original version of the model with parameterized couplings. But unlike that, in which the parametrization is directly inserted in the coupling constants of the Glendenning model, we present here a method for the derivation of the parametric dependence of the coupling terms, in a way that allows in one side to consistently justify this parametrization and in the other to extend in a coherent way the range of possibilities of parameterizations in effective models with derivative couplings. The extended model is then applied to the description of the mass of neutron stars.

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