VIEIRA, Ronaldo S S and Wlodzimierz KLUŹNIAK. Astrophysical cloaking of a naked singularity. Monthly Notices of the Royal Astronomical Society. 2023, vol. 523, No 3, p. 4615-4623. ISSN 0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stad1718.
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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
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher United Kingdom of Great Britain and Northern Ireland
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/47813059:19630/23:A0000300
Organization unit Institute of physics in Opava
Doi http://dx.doi.org/10.1093/mnras/stad1718
UT WoS 001023556700032
Keywords in English gravitation;stars: atmospheres;stars: neutronlGalaxy: centre;quasars: supermassive black holes;X-rays: binaries
Tags RIV24, UF
Tags International impact, Reviewed
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 22/1/2024 14:27.
Abstract
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.
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