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Recent results on the end of black hole evaporation give new weight to thehypothesis that a component of dark matter could be formed by remnants ofevaporated black holes: stable Planck-size white holes with a large interior.The expected lifetime of these objects is consistent with their production atreheating. But remnants could also be pre-big bang relics in a bouncecosmology, and this possibility has strong implications on the issue of thesource of past low entropy: it could realise a perspectival interpretation ofpast low entropy. The ideas briefly presented in this essay are developed inforthcoming papers.

White-hole dark matter and the origin of past low-entropy