Extended Tolman III and VII solutions in f (R, T) gravity: Models for neutron stars and supermassive stars

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F22%3AA0000204" target="_blank" >RIV/47813059:19630/22:A0000204 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.aps.org/prd/abstract/10.1103/PhysRevD.106.124014" target="_blank" >https://journals.aps.org/prd/abstract/10.1103/PhysRevD.106.124014</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.106.124014" target="_blank" >10.1103/PhysRevD.106.124014</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Extended Tolman III and VII solutions in f (R, T) gravity: Models for neutron stars and supermassive stars

Popis výsledku v původním jazyce

In the context of linear f(R, T) = R chi T gravity, where R is the Ricci scalar, T is the trace of the energy-momentum tensor, and chi is a dimensionless parameter, we have obtained exact analytical and numerical solutions for isotropic perfect-fluid spheres in hydrostatic equilibrium. Our solutions correspond to two-parametric extensions of the Tolman III (T-III) and Tolman VII (T-VII) models, in terms of the compactness beta and chi. By requiring configurations that exhibit monotonically decreasing radial profiles for both the energy density and pressure, compliance with the energy conditions, as well as subluminal speed of sound, we have constrained the parametric space of our solutions. We have also obtained analytically a parametric deformation of the T-VII solution that continuously interpolates between the T-III and T-VII models for any chi, and in the appropriate limits, provides an analytic approximation for the uniform density configuration in linear f(R, T) gravity. Finally, by integrating numerically the TOV equations, we have obtained a numerical solution for the uniform-density configuration and subsequently, using the mass -radius relations, we have obtained the maximum mass that can be supported by such configurations. We have found that in the appropriate parametric regime our solution is in very good agreement with the observational bounds for the masses and radii of neutron stars.

Název v anglickém jazyce

Extended Tolman III and VII solutions in f (R, T) gravity: Models for neutron stars and supermassive stars

Popis výsledku anglicky

In the context of linear f(R, T) = R chi T gravity, where R is the Ricci scalar, T is the trace of the energy-momentum tensor, and chi is a dimensionless parameter, we have obtained exact analytical and numerical solutions for isotropic perfect-fluid spheres in hydrostatic equilibrium. Our solutions correspond to two-parametric extensions of the Tolman III (T-III) and Tolman VII (T-VII) models, in terms of the compactness beta and chi. By requiring configurations that exhibit monotonically decreasing radial profiles for both the energy density and pressure, compliance with the energy conditions, as well as subluminal speed of sound, we have constrained the parametric space of our solutions. We have also obtained analytically a parametric deformation of the T-VII solution that continuously interpolates between the T-III and T-VII models for any chi, and in the appropriate limits, provides an analytic approximation for the uniform density configuration in linear f(R, T) gravity. Finally, by integrating numerically the TOV equations, we have obtained a numerical solution for the uniform-density configuration and subsequently, using the mass -radius relations, we have obtained the maximum mass that can be supported by such configurations. We have found that in the appropriate parametric regime our solution is in very good agreement with the observational bounds for the masses and radii of neutron stars.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review D

ISSN

2470-0010

e-ISSN

—

Svazek periodika

106

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

25

Strana od-do

„124014-1“-„124014-25“

Kód UT WoS článku

000901634800001

EID výsledku v databázi Scopus

2-s2.0-85143803494