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

Language

English

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

References:

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
Změněno: 22/1/2024 14:27, Mgr. Pavlína Jalůvková

Abstract

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