Gravitational waves from burdened primordial black holes dark matter

Abstract

Primordial black holes (PBHs) are the natural candidate of dark matter (DM) as they only interact gravitationally and can evade any experiments on earth. In the standard semiclassical calculation of Hawking radiation, PBHs with mass below $10^{15}\mathrm{g}$ evaporated by now and therefore cannot be DM. However, the recently-discovered quantum memory burden effect can significantly suppress the evaporation of PBHs after the half-decay time. This quantum effect could open up a new mass window below $10^{10}\mathrm{g}$ where PBHs can still exist today and be DM. In this paper, we compute the gravitational wave (GW) signals associated with the formation of PBHs in this new mass window. We consider two formation scenarios: PBHs formed from inflationary perturbation and PBHs formed from collapse of Fermi-balls in a first-order phase transition (FOPT). GWs produced from these two scenarios have distinct features and, while the GW from inflation peaks at high frequency, the GW from FOPT peaks at lower frequency that can be within the reach of future experiments.

23 pages, 4 figures, 1 table; published version in Physical Review D

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Cited by in corpus (6)

• Beyond Hawking evaporation of black holes formed by dark matter in compact stars
• Impact of memory-burdened black holes on primordial gravitational waves in light of Pulsar Timing Array
• High-energy gamma-ray emission from memory-burdened primordial black holes
• Impact of memory-burdened primordial black holes on high-scale leptogenesis
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• Scalar-Induced Gravitational Waves in Palatini $f(R)$ Gravity