Can we detect a supertranslated black hole?

Abstract

We attempt to address the question of whether standard tests of general relativity can detect the presence of a black hole carrying a supertranslation field. In this regard, we study the photon sphere of a dynamical black hole carrying a supertranslation hair. We find that the dynamics of the photon sphere is quite subtle and it may offer an opportunity to differentiate a supertranslated black hole from its bald counterpart. This represents a first step towards understanding the observational signatures of a supertranslated dynamical black hole.

arXiv comment8 Pages, 4 Figures, text substantially modified, new results added, to appear in Physical Review D

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Cited by in corpus (11)

• Analytical study of gravitational lensing in Kerr-Newman black-bounce spacetime
• Dynamical photon sphere and time evolving shadow around black holes with temporal accretion
• Black Hole Shadow with Soft Hair
• The Shadow of Supertranslated Schwarzschild Black Hole
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