Black hole in asymmetric cosmological bounce. Issue 1 (24th January 2021)

• Record Type: Journal Article
• Authors: Pérez, Daniela; Perez Bergliaffa, Santiago E.; Romero, Gustavo E.
• Other Names: Zen Vasconcellos C.A. guestEditor.; Hess P.O. guestEditor.; Piccinelli G. guestEditor.; Vargas Magaña M. guestEditor.; Ureña-Lopez L. guestEditor.; González Felipe R. guestEditor.; Boller Th. guestEditor.; Gullberg S. guestEditor.
• Is Part Of: Astronomische Nachrichten. Volume 342:Issue 1/2(2021)
• Page Start: 69
• Page End: 74
• Publication Date: 2021-01-24
• Subjects: black holes -- cosmology -- general relativity; Astronomy -- Periodicals; 520.5
• DOI: 10.1002/asna.202113883
• Languages: English
• ISSNs: 0004-6337

Abstract

Abstract: We determine the causal structure of the McVittie spacetime for a cosmological model with an asymmetric bounce. The analysis includes the computation of trapping horizons; regular, trapped, and antitrapped regions; and the integration of the trajectories of radial null geodesics before, during, and after the bounce. We find a trapped region since the beginning of the contracting phase up to shortly before the bounce, thus showing the existence of a black hole. When the universe reaches a certain minimum scale in the contracting phase, the trapping horizons disappear, and the central singularity becomes naked. These results suggest that neither a contracting nor an expanding universe can accommodate a black hole at all times.