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 a Zdeněk STUCHLÍK

Základní údaje

Originální název

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

Autoři

VRBA, Jaroslav (203 Česká republika, garant, domácí); Martin URBANEC (203 Česká republika, domácí) a Zdeněk STUCHLÍK (203 Česká republika, domácí)

Vydání

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, od s. 223-235, 13 s. 2017

Nakladatel

Slezská univerzita v Opavě, Filozoficko–přírodovědecká fakulta v Opavě, Ústav fyziky

Další údaje

Jazyk

angličtina

Typ výsledku

Stať ve sborníku

Obor

10308 Astronomy

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Forma vydání

tištěná verze "print"

Odkazy

RAGtime 17-19

Kód RIV

RIV/47813059:19240/17:A0000036

Organizační jednotka

Filozoficko-přírodovědecká fakulta v Opavě

ISBN

978-80-7510-256-0

ISSN

EID Scopus

2-s2.0-85041830433

Klíčová slova anglicky

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

Příznaky

Mezinárodní význam, Recenzováno

Návaznosti

GA17-16287S, projekt VaV. GB14-37086G, projekt VaV.

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

Anotace

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 a 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. 1. vyd. Opava (Česká republika): Slezská univerzita v Opavě, Filozoficko–přírodovědecká fakulta v Opavě, Ústav fyziky, 2017, s. 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  - CONF
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 a 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}. 1. vyd. Opava (Česká republika): Slezská univerzita v Opavě, Filozoficko–přírodovědecká fakulta v Opavě, Ústav fyziky, 2017, s.~223-235. ISBN~978-80-7510-256-0.

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