Articulo
Black hole in asymmetric cosmological bounce
Registro en:
issn:0004-6337
issn:1521-3994
Autor
Pérez, Daniela
Pérez Bergliaffa, Santiago Esteban
Romero, Gustavo Esteban
Institución
Resumen
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 anti-trapped 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. Facultad de Ciencias Astronómicas y Geofísicas Instituto Argentino de Radioastronomía