Trapping of null geodesics in slowly rotating spacetimes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F20%3AA0000058" target="_blank" >RIV/47813059:19630/20:A0000058 - isvavai.cz</a>
Result on the web
<a href="https://link.springer.com/article/10.1140/epjc/s10052-020-08642-z" target="_blank" >https://link.springer.com/article/10.1140/epjc/s10052-020-08642-z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-020-08642-z" target="_blank" >10.1140/epjc/s10052-020-08642-z</a>
Alternative languages
Result language
angličtina
Original language name
Trapping of null geodesics in slowly rotating spacetimes
Original language description
Extremely compact objects containing a region of trapped null geodesics could be of astrophysical relevance due to trapping of neutrinos with consequent impact on cooling processes or trapping of gravitational waves. These objects have previously been studied under the assumption of spherical symmetry. In the present paper, we consider a simple generalization by studying trapping of null geodesics in the framework of the Hartle-Thorne slow-rotation approximation taken to first order in the angular velocity, and considering a uniform-density object with uniform emissivity for the null geodesics. We calculate effective potentials and escape cones for the null geodesics and how they depend on the parameters of the spacetimes, and also calculate the "local" and "global" coefficients of efficiency for the trapping. We demonstrate that due to the rotation the trapping efficiency is different for co-rotating and retrograde null geodesics, and that trapping can occur even for R>3GM/c2, contrary to what happens in the absence of rotation.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/LTC18058" target="_blank" >LTC18058: Neutron stars and pulsars</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Physical Journal C
ISSN
1434-6044
e-ISSN
1434-6052
Volume of the periodical
80
Issue of the periodical within the volume
11
Country of publishing house
US - UNITED STATES
Number of pages
20
Pages from-to
„1065-1“-„1065-20“
UT code for WoS article
000595358600007
EID of the result in the Scopus database
2-s2.0-85096210789