D
2017
Escape cones of null-geodesics from the interior of rotating compact stars
VRBA, Jaroslav, Martin URBANEC and Zdeněk STUCHLÍK
Basic information
Original name
Escape cones of null-geodesics from the interior of rotating compact stars
Edition
1. vyd. Opava (Česká republika), Proceedings of RAGtime 17–19: Workshops on black holes and neutron stars, 17–19/23–26 Oct., 1–5 Nov. 2015/2016/2017, Opava, Czech Republic, p. 223-235, 13 pp. 2017
Publisher
Slezská univerzita v Opavě, Filozoficko–přírodovědecká fakulta v Opavě, Ústav fyziky
Other information
Type of outcome
Stať ve sborníku
Field of Study
10308 Astronomy
Country of publisher
Czech Republic
Confidentiality degree
není předmětem státního či obchodního tajemství
Publication form
printed version "print"
RIV identification code
RIV/47813059:19240/17:A0000036
Organization unit
Faculty of Philosophy and Science in Opava
Keywords in English
compact object; axially symmetric spacetime; trapped null-geodesic; effective potential; escape cone
Tags
International impact, Reviewed
Links
GA17-16287S, research and development project. GB14-37086G, research and development project.
V originále
In this work we present investigation of the escape cones of null-geodesics from the interior of rotating homogeneous compact stars in the model, where only terms linear in the star’s rotational frequency are assumed. We focus on the single model of the star with particular radius R = 2.8M (using units in which c = G = 1) rotating with different values of angular momentum J. We vary the position of the isotropically radiating source both in radial and latitudinal direction and we show the impact of the position and the rotational rate on the shape of the escape cone of null-geodesics. We find that even for small rotational rate corresponding to j = J/M^2 = 0.1 the impact on the escape cones is rather strong. The escape cones are no longer symmetrical around radial direction, and it is clearly seen that the radiation in the direction of the rotation can easily reach the infinity. On the other hand, the radiation in the direction opposite to the rotation will be trapped in the interior of the star. We discuss possible astrophysical relevance of our results.
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