Table of Contents
Universe, Volume 4, Issue 11 (November 2018)
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Cover Story (view full-size image) Quantum gravity provides a concrete mechanism to describe the final stage of black-hole life, [...] Read more. Quantum gravity provides a concrete mechanism to describe the final stage of black-hole life, allowing for a stable remnant of Planck mass. We consider the possibility that dark matter could be composed by black-hole remnants formed before the big bang in a bouncing cosmology. This scenario yields two interesting features. First, if black holes constitute the dominating component during the contracting phase, the resulting power spectrum can be almost scale-invariant, without the necessity of an inflationary phase. In the absence of inflation, remnants do not become diluted and they can be sufficiently dense to saturate dark matter. Second, the internal volume of the remnants accommodates a large number of microstates: the early-universe low entropy would then be a property due to observations made with no access to remnant interiors, not a general property of the geometry of the universe. View this paper.