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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

Physical Review D

ISSN

2470-0010

e-ISSN

—

Volume of the periodical

106

Issue of the periodical within the volume

12

Country of publishing house

US - UNITED STATES

Number of pages

25

Pages from-to

„124014-1“-„124014-25“

UT code for WoS article

000901634800001

EID of the result in the Scopus database

2-s2.0-85143803494