Escape cones of null-geodesics from the interior of rotating
compact stars

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

Authors

VRBA, Jaroslav (203 Czech Republic, guarantor, belonging to the institution), Martin URBANEC (203 Czech Republic, belonging to the institution) and Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution)

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

Language

English

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"

References:

RAGtime 17-19

RIV identification code

RIV/47813059:19240/17:A0000036

Organization unit

Faculty of Philosophy and Science in Opava

ISBN

978-80-7510-256-0

ISSN

Keywords in English

compact object; axially symmetric spacetime; trapped null-geodesic; effective potential; escape cone

Links

GA17-16287S, research and development project. GB14-37086G, research and development project.

Změněno: 6/4/2018 08:55, RNDr. Jan Hladík, Ph.D.

Abstract

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.

Citovat

VRBA, Jaroslav, Martin URBANEC and Zdeněk STUCHLÍK. Escape cones of null-geodesics from the interior of rotating compact stars. In Z. Stuchlík, G. Török a V. Karas. 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. 1st ed. Opava (Česká republika): Slezská univerzita v Opavě, Filozoficko–přírodovědecká fakulta v Opavě, Ústav fyziky, 2017, p. 223-235. ISBN 978-80-7510-256-0.

@inproceedings{29916,
   author = {Vrba, Jaroslav and Urbanec, Martin and Stuchlík, Zdeněk},
   address = {Opava (Česká republika)},
   booktitle = {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},
   edition = {1.},
   editor = {Z. Stuchlík, G. Török a V. Karas},
   keywords = {compact object; axially symmetric spacetime; trapped null-geodesic; effective potential; escape cone},
   howpublished = {tištěná verze "print"},
   language = {eng},
   location = {Opava (Česká republika)},
   isbn = {978-80-7510-256-0},
   pages = {223-235},
   publisher = {Slezská univerzita v Opavě, Filozoficko–přírodovědecká fakulta v Opavě, Ústav fyziky},
   title = {Escape cones of null-geodesics from the interior of rotating compact stars},
   url = {http://proceedings.physics.cz/index.php/ragtime-book/proceedings-of-ragtime-17-19},
   year = {2017}
}

TY  - JOUR
ID  - 29916
AU  - Vrba, Jaroslav - Urbanec, Martin - Stuchlík, Zdeněk
PY  - 2017
TI  - Escape cones of null-geodesics from the interior of rotating compact stars
PB  - Slezská univerzita v Opavě, Filozoficko–přírodovědecká fakulta v Opavě, Ústav fyziky
CY  - Opava (Česká republika)
SN  - 9788075102560
KW  - compact object
KW  - axially symmetric spacetime
KW  - trapped null-geodesic
KW  - effective potential
KW  - escape cone
UR  - http://proceedings.physics.cz/index.php/ragtime-book/proceedings-of-ragtime-17-19
L2  - http://proceedings.physics.cz/index.php/ragtime-book/proceedings-of-ragtime-17-19
N2  - 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.
ER  -

VRBA, Jaroslav, Martin URBANEC and Zdeněk STUCHLÍK. Escape cones of null-geodesics from the interior of rotating compact stars. In Z. Stuchlík, G. Török a V. Karas. \textit{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}. 1st ed. Opava (Česká republika): Slezská univerzita v Opavě, Filozoficko–přírodovědecká fakulta v Opavě, Ústav fyziky, 2017, p.~223-235. ISBN~978-80-7510-256-0.

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