J
2023
Astrophysical cloaking of a naked singularity
VIEIRA, Ronaldo S S and Wlodzimierz KLUŹNIAK
Basic information
Original name
Astrophysical cloaking of a naked singularity
Authors
VIEIRA, Ronaldo S S and Wlodzimierz KLUŹNIAK (616 Poland, belonging to the institution)
Edition
Monthly Notices of the Royal Astronomical Society, 2023, 0035-8711
Other information
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
United Kingdom of Great Britain and Northern Ireland
Confidentiality degree
není předmětem státního či obchodního tajemství
RIV identification code
RIV/47813059:19630/23:A0000300
Organization unit
Institute of physics in Opava
Keywords in English
gravitation;stars: atmospheres;stars: neutronlGalaxy: centre;quasars: supermassive black holes;X-rays: binaries
Tags
International impact, Reviewed
V originále
A massive naked singularity would be cloaked by accreted matter, and thus may appear to a distant observer as an opaque (quasi-)spherical surface of a fluid, not unlike that of a star or planet. We present here analytical solutions for levitating atmospheres around a wide class of spherically symmetric naked singularities. Such an atmosphere can be constructed in every space-time which possesses a zero-gravity radius and which is a solution of a (modified-)gravity theory possessing the usual conservation laws for matter. Its density peaks at the zero-gravity radius and the atmospheric fluid is supported against infall onto the singularity by gravity alone. In an astrophysical context, an opaque atmosphere would be formed in a very short time by accretion of ambient matter onto the singularity - in a millisecond for an X-ray binary, in a thousand seconds for a singularity traversing interstellar space, and a thousand years for a singularity that is the central engine of an AGN.
Displayed: 25/12/2024 07:36