Detailed Information on Publication Record
2021
Trapping of null geodesics in slowly rotating extremely compact Tolman VII spacetimes
STUCHLÍK, Zdeněk and Jaroslav VRBABasic information
Original name
Trapping of null geodesics in slowly rotating extremely compact Tolman VII spacetimes
Authors
STUCHLÍK, Zdeněk (203 Czech Republic, belonging to the institution) and Jaroslav VRBA (203 Czech Republic, belonging to the institution)
Edition
European Physical Journal Plus, 2021, 2190-5444
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
Germany
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
RIV identification code
RIV/47813059:19630/21:A0000133
Organization unit
Institute of physics in Opava
UT WoS
000701060200003
Keywords in English
NEUTRON-STARS;FIELD;CONSTANT;DENSITY;SPHERES
Tags
International impact, Reviewed
Links
LTC18058, research and development project.
Změněno: 4/2/2022 14:01, Mgr. Pavlína Jalůvková
Abstract
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.