Particle motion around luminous neutron stars: Effects of deviation from Schwarzschild spacetime

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F24%3AA0000384" target="_blank" >RIV/47813059:19630/24:A0000384 - isvavai.cz</a>

Result on the web

<a href="https://journals.aps.org/prd/abstract/10.1103/PhysRevD.110.064010" target="_blank" >https://journals.aps.org/prd/abstract/10.1103/PhysRevD.110.064010</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.110.064010" target="_blank" >10.1103/PhysRevD.110.064010</a>

Result language

angličtina

Original language name

Particle motion around luminous neutron stars: Effects of deviation from Schwarzschild spacetime

Original language description

We study trajectories of test particles around a luminous, static, spherically symmetric neutron star, under the combined influence of gravity and radiation. In general relativity, for Schwarzschild spacetime, an equilibrium sphere (the Eddington capture sphere) is formed for near-Eddington luminosities. We generalize these results to a broad class of static, spherical spacetimes. We also study the dynamics of particles in a strong radiation field in spherical spacetimes. The results are illustrated for two cases, Reissner-Nordstrom spacetime of a charged spherical object in general relativity and Kehagias-Sfetsos spacetime, arising from the Ho.rava-Lifshitz gravity theory. Our findings apply to neutron stars under gravitational field equations different from the vacuum Einstein field equations of general relativity, such as in modified theories of gravity, the only requirement being that test particles follow geodesics in the absence of the radiation field. The effects that we describe are, in principle, measurable through observations of x-ray bursts of neutron stars. Hence, detailed future studies could use such observations to test gravity theories in the strong-field regime, provided that the impact of the spacetime geometry can be disentangled from the astrophysical uncertainties.

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

2024

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

110

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

„064010-1“-„064010-9“

UT code for WoS article

001371243900021

EID of the result in the Scopus database

2-s2.0-85203587460