Nonthermal production of dark matter from primordial black holes

Abstract

We present a scenario for non-thermal production of dark matter from evaporation of primordial black holes. A period of very early matter domination leads to formation of black holes with a maximum mass of 2 × 10 8 g, whose subsequent evaporation prior to big bang nucleosynthesis can produce all of the dark matter in the universe. We show that the correct relic abundance can be obtained in this way for thermally underproduced dark matter in the 100 GeV-10 TeV mass range. To achieve this, the scalar power spectrum at small scales relevant for black hole formation should be enhanced by a factor of O(10 5 ) relative to the scales accessible by the cosmic microwave background experiments.

Black hole induced false vacuum decay from first principles

“…Whereas in our method the tunneling solutions are essentially complex and live on a contour in the complex time that in general cannot be continuously deformed into the real axis because of branch-cut singularities. 19 Further, in the case of false vacuum decay in flat space the stochastic approach tends to significantly overestimate the decay rate [82], whereas our method recovers exactly the results of the standard Euclidean description. On the other hand, we expect the stochastic approach to work well for tunneling from states with large occupation numbers [75][76][77][78], such as the Hartle-Hawking and Unruh vacua in the background of a two-dimensional BH with high temperature.…”

“…Such BHs appear in a variety of early Universe models and can play important roles in cosmology, including reheating of the Universe, production of baryon asymmetry and dark matter, etc. [17][18][19][20][21][22][23][24] (see also [25] for a review of primordial BH production mechanisms and constraints). The results of refs.…”

Evaporating primordial black holes, the string axiverse, and hot dark radiation

“…The integrated flux of ALPs from a single PBH is ∼ 3 × 10 22 N a (10 10 kg/M )s −1 in the relevant PBH spin range. Unlike the case of greatly-red-shifted dark matter particles and/or axions produced by the Hawking evaporation of micro PBHs in the very early pre-BBN universe [40][41][42][43] the axions in our case are hardly red-shifted at all as the relevant Hawking emission is occurring now.…”

Melanopogenesis: dark matter of (almost) any mass and baryonic matter from the evaporation of primordial black holes weighing a ton (or less)

“…Ref. [16] and [17] recently focused on production of dark matter from black hole evaporation (the second specifically WIMP dark matter), while Ref. [18] and [19] considered scenarios technically similar to asymmetric dark matter production from black hole evaporation that we also entertain below, although the first study in the context of mirror matter and the second in the context of asymmetric Hawking radiation.…”