2021/01/01 by Daniela Pérez, Santiago E. Perez Bergliaffa, Gustavo E. Romero · 3 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Black Holes and Theoretical Physics #Black hole (networking) #Cosmology and Gravitation Theories #Geodesic #Null (SQL) #Primordial black hole #Singularity #Spacetime #Universe #White hole #astro-ph.CO #de Sitter–Schwarzschild metric #gr-qc
paper · pdf · doi:10.1002/asna.202113883
published in Astronomische Nachrichten 342(1-2), 69-74 (Wiley) · 6 pages, 8 figures, accepted for publication in Astronomische Nachrichten. arXiv admin note: substantial text overlap with arXiv:2103.00108
openalex publication_date 2021/01/01 · openalex created_date 2021/02/01 · arxiv created 2021/03/01 · arxiv updated 2021/03/03 · openalex updated_date 2026/08/05
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.