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Abstract: We derive a strong upper bound on the amount of Primordial Black Holes PBHsthat can still be present in the Universe. Gravitational capture of PBHs by theMilky Way stars during their formation and subsequent accretion would produce adramatic depletion of disk stars and especially of white dwarfs, unless theaverage cosmic density and mass of PBHs are severely constrained. Our findingalso helps to discriminate among the various production mechanisms of PBHs.Moreover, we show that a star becomes overluminous before its disappearanceinto a PBH for a time span independent of its mass, thereby providing acharacteristic observational signature of the considered scenario. We stressthat our result allows for the existence of stellar-mass black holes in a massrange that is forbidden by standard stellar evolution.



Author: Marco Roncadelli INFN, Sezione di Pavia, Italy, Aldo Treves Physics Department, Universita' dell'Insubria, Italy, Rober

Source: https://arxiv.org/







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