J 2021

Trapping of null geodesics in slowly rotating extremely compact Tolman VII spacetimes

STUCHLÍK, Zdeněk a Jaroslav VRBA

Základní údaje

Originální název

Trapping of null geodesics in slowly rotating extremely compact Tolman VII spacetimes

Autoři

STUCHLÍK, Zdeněk (203 Česká republika, domácí) a Jaroslav VRBA (203 Česká republika, domácí)

Vydání

European Physical Journal Plus, 2021, 2190-5444

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Německo

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Kód RIV

RIV/47813059:19630/21:A0000133

Organizační jednotka

Fyzikální ústav v Opavě

DOI

http://dx.doi.org/10.1140/epjp/s13360-021-01890-2

UT WoS

000701060200003

Klíčová slova anglicky

NEUTRON-STARS;FIELD;CONSTANT;DENSITY;SPHERES

Štítky

2022, , RIV22

Příznaky

Mezinárodní význam, Recenzováno

Návaznosti

LTC18058, projekt VaV.
Změněno: 4. 2. 2022 14:01, Mgr. Pavlína Jalůvková

Anotace

V originále

Region of trapped null geodesics hidden inside of extremely compact objects is of astrophysical importance because of trapping of gravitational waves, or neutrinos. The trapping effect of null geodesics was extensively studied for spherically symmetric extremely compact objects. Recently, influence of rotation of the extremely compact objects on the trapping of null geodesics was treated in the simplest possible model of internal linearized Hartle-Thorne spacetime with uniform energy density distribution and uniform emissivity distribution of null geodesics. Here, we extend the study of the rotation influence on the trapping effect in the case of linearized Hartle-Thorne spacetimes based on the Tolman VII spherically symmetric solutions, where we assume the emissivity of the null geodesics proportional to the energy density of the Tolman VII object having quadratic radial profile. We demonstrate enhancement (suppression) of the trapping effect in the case of counter-rotating (co-rotating) null geodesics due to the behavior of the effective potentials and escape cones of the null geodesics in the linearized Hartle-Thorne-Tolman VII spacetimes. In dependence on the parameters of these spacetimes, we determine the "local" and "global" coefficients of efficiency of the trapping and compare the results to those related to the rotating spacetimes based on the internal Schwarzschild spacetimes. We demonstrate that in the Tolman VII spacetimes the trapping is more efficient, being allowed in objects with radii larger than those of the trapping internal Schwarzschild spacetimes, occurring even for R > 3.3 M.
Zobrazeno: 25. 12. 2024 10:24