White-hole dark matter and the origin of past low-entropy
arXiv:1804.04147
Abstract
Recent results on the end of black hole evaporation give new weight to the hypothesis that a component of dark matter could be formed by remnants of evaporated black holes: stable Planck-size white holes with a large interior. The expected lifetime of these objects is consistent with their production at reheating. But remnants could also be pre-big bang relics in a bounce cosmology, and this possibility has strong implications on the issue of the source of past low entropy: it could realise a perspectival interpretation of past low entropy. The ideas briefly presented in this essay are developed in forthcoming papers.
Short entry. Essay written for the Gravity Research Foundation 2018 Awards for Essays on Gravitation. The ideas briefly introduced in this paper are developped in arXiv:1805.03872 and arXiv:1805.03224