Do black hole shadows merge?

Kazumasa Okabayashi, Nobuyuki Asaka, and Ken-ichi Nakao
Phys. Rev. D 102, 044011 – Published 6 August 2020

Abstract

The so-called black hole shadow is not a silhouette of a black hole but an image of a collapsing object or a white hole. Hence it is nontrivial whether black hole shadows merge with each other when black holes coalesce with each other. In this paper, by analyzing the null geodesic generators of the event horizon in Kastor-Traschen spacetime which describes a coalescence of black boles, we see that observers who will never see a merger of black hole shadows exist.

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  • Received 23 March 2020
  • Accepted 13 July 2020

DOI:https://doi.org/10.1103/PhysRevD.102.044011

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Kazumasa Okabayashi1,*, Nobuyuki Asaka1,†, and Ken-ichi Nakao1,2,‡

  • 1Department of Mathematics and Physics, Graduate School of Science, Osaka City University, Sumiyoshi, Osaka City 558-8585, Japan
  • 2Nambu Yoichiro Institute of Theoretical and Experimental Physics, Osaka City University, Sumiyoshi, Osaka City 558-8585, Japan

  • *okabayashi@ka.osaka-cu.ac.jp
  • asaka@sci.osaka-cu.ac.jp
  • knakao@sci.osaka-cu.ac.jp

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Issue

Vol. 102, Iss. 4 — 15 August 2020

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