Detailed Information on Publication Record
2010
Appearance of Keplerian discs orbiting Kerr superspinars
SCHEE, Jan and Zdeněk STUCHLÍKBasic information
Original name
Appearance of Keplerian discs orbiting Kerr superspinars
Authors
Edition
Classical and Quantum Gravity, GB - Spojené království Velké Británie a, 2010, 0264-9381
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Confidentiality degree
není předmětem státního či obchodního tajemství
Organization unit
Faculty of Philosophy and Science in Opava
UT WoS
000283059500022
Keywords in English
NONZERO COSMOLOGICAL CONSTANT, QUASI-PERIODIC OSCILLATIONS, BLACK-HOLE SPIN, HIGH-FREQUENCY QPOS, NAKED-SINGULARITY, GRAVITATIONAL COLLAPSE, ACCRETION DISK, COSMIC CENSORSHIP, RESONANCE MODEL, NULL GEODESICS
Tags
Tags
International impact, Reviewed
Links
GA202/09/0772, research and development project. LC06014, research and development project. MSM4781305903, plan (intention).
Změněno: 13/1/2021 10:52, Mgr. Pavlína Jalůvková
Abstract
V originále
We study optical phenomena related to the appearance of Keplerian accretion discs orbiting Kerr superspinars predicted by string theory. The superspinar exterior is described by standard Kerr naked singularity geometry breaking the black hole limit on the internal angular momentum (spin). We construct local photon escape cones for a variety of orbiting sources that enable us to determine the superspinars silhouette in the case of distant observers. We show that the superspinar silhouette depends strongly on the assumed edge where the external Kerr spacetime is joined to the internal spacetime governed by string theory and significantly differs from the black hole silhouette. The appearance of the accretion disc is strongly dependent on the value of thesuperspinar spin in both their shape and frequency shift profile.