Identification of a Regular Black Hole by Its Shadow

We study shadows of regular rotating black holes described by the axially symmetric solutions asymptotically Kerr for a distant observer, obtained from regular spherical solutions of the Kerr–Schild class specified by T t t = T r r ( p r = − ε ) . All regular solutions obtained with the Newman–Janis...

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Bibliographic Details
Published inUniverse (Basel) Vol. 5; no. 7; p. 163
Main Authors Dymnikova, Irina, Kraav, Kirill
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 03.07.2019
Subjects
Algorithms
Asymmetry
Black holes
de Sitter vacuum
Energy
Numerical analysis
Radiation
regular black holes
shadows
Spacetime
Symmetry
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ISSN2218-1997
2218-1997
DOI10.3390/universe5070163

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Summary:We study shadows of regular rotating black holes described by the axially symmetric solutions asymptotically Kerr for a distant observer, obtained from regular spherical solutions of the Kerr–Schild class specified by T t t = T r r ( p r = − ε ) . All regular solutions obtained with the Newman–Janis algorithm belong to this class. Their basic generic feature is the de Sitter vacuum interior. Information about the interior content of a regular rotating de Sitter-Kerr black hole can be in principle extracted from observation of its shadow. We present the general formulae for description of shadows for this class of regular black holes, and numerical analysis for two particular regular black hole solutions. We show that the shadow of a de Sitter-Kerr black hole is typically smaller than that for the Kerr black hole, and the difference depends essentially on the interior density and on the pace of its decreasing.
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ISSN:2218-1997
2218-1997
DOI:10.3390/universe5070163