Persisting black holes in a bouncing universe

D. PEREZ; ROMERO, GUSTAVO E

Buenos Aires

Congreso; Reunion Anual de la Asociación Argentina de Astronomía; 2021

We analyze whether a black hole could exist and persist in a universe that goes through a phase ofcontraction, bounce and subsequent expansion. To this end, we investigate the comoving generalized McVittiemetric that represents an inhomogeneity embedded in Friedmann-Lemaˆıtre-Robertson-Walker universe and allowsinteraction with the cosmic fluid. We compute the trapping horizons, spacetime regions and determine the lightcone structure. The analysis of the causal structure leads us to conclude that a dynamical black hole survivesthe cosmological bounce and continues to exist in the expanding phase of the universe. This result implies thatbouncing cosmologies admit black holes at all epochs and that these black holes might play some role in theexpanding phase of the universe.