Shadows of Kerr-de Sitter naked singularities

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F24%3AA0000368" target="_blank" >RIV/47813059:19630/24:A0000368 - isvavai.cz</a>

Result on the web

<a href="https://journals.aps.org/prd/abstract/10.1103/PhysRevD.109.064008" target="_blank" >https://journals.aps.org/prd/abstract/10.1103/PhysRevD.109.064008</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.109.064008" target="_blank" >10.1103/PhysRevD.109.064008</a>

Result language

angličtina

Original language name

Shadows of Kerr-de Sitter naked singularities

Original language description

We present a classification of Kerr-de Sitter spacetimes based on the presence of horizons, ergospheres, and the characteristics of photon motion. We utilize the concept of local escape cones for isotropically radiating point sources to create shadows of the Kerr-de Sitter naked singularities within a class containing astrophysically relevant parameters. For completeness, we also consider in the construction photons entering the region of negative radii of the naked singularity spacetimes. The shadow construction is associated with two astrophysically significant families of local reference frames (or local observers). The first family represents locally nonrotating frames that, near the so-called static radius in Kerr-de Sitter spacetimes, exhibit characteristics similar to those of static observers at large distances in asymptotically flat spacetimes. The second family involves radially escaping geodesic frames, which are suitable for constructing the shadow near the cosmological horizon of Kerr-de Sitter spacetimes. We explore how the aberration effect, caused by the motion of free observers due to the repulsive influence of the cosmological constant, modifies the shadow in comparison to those related to stationary locally nonrotating observers.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review D

ISSN

2470-0010

e-ISSN

—

Volume of the periodical

109

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

49

Pages from-to

„064008-1“-„064008-49“

UT code for WoS article

001196566600007

EID of the result in the Scopus database

2-s2.0-85186860915