München 2019 – scientific programme
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GR: Fachverband Gravitation und Relativitätstheorie
GR 10: GR and Astrophysics I
GR 10.3: Talk
Thursday, March 21, 2019, 12:00–12:15, HS 4
Black hole shadow in an expanding universe with a cosmological constant — •Volker Perlick1, Oleg Tsupko2, and Gennady Bisnovatyi-Kogan2 — 1ZARM, University of Bremen, 28359 Bremen, Germany — 2Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, Moscow 117997, Russia
We analytically investigate the influence of a cosmic expansion on the shadow of the Schwarzschild black hole. We suppose that the expansion is driven by a cosmological constant only and use the Kottler (or Schwarzschild-eSitter) spacetime as a model for a Schwarzschild black hole embedded in a deSitter universe. We calculate the angular radius of the shadow for an observer who is comoving with the cosmic expansion. It is found that the angular radius of the shadow shrinks to a non-zero finite value if the comoving observer approaches infinity. -- The talk presents results that have been published in Phys. Rev. D 97, 104062 (2018).