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Breakdown of Hawking Evaporation opens new Mass Window for Primordial Black Holes as Dark Matter Candidate
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abstract
The energy injection through Hawking evaporation has been used to put strong constraints on primordial black holes as a dark matter candidate at masses below $10^{17}\,\rm{g}$. However, Hawking's semiclassical approximation breaks down at latest after half-decay. Beyond this point, the evaporation could be significantly suppressed, as was shown in recent work. In this study, we review existing cosmological and astrophysical bounds on primordial black holes, taking this effect into account. We show that the constraints disappear completely for a reasonable range of parameters, which opens a new window below $10^{10}\,\rm{g}$ for light primordial black holes as a dark matter candidate.
Forward citations
Cited by 7 Pith papers
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Evaporating cosmologically coupled black holes
If a black hole's mass grows with cosmic expansion, Hawking evaporation is slowed or reversed, weakening gamma-ray bounds on primordial black holes.
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Black Hole Memory Burden and its Signatures in Gravitational Waves from Mergers
Swift memory burden shifts black-hole quasinormal-mode frequencies by an amount set by the memory-load parameter μ and critical exponent p, with μ able to exceed the progenitor's information content.
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Revisiting PBH accretion, evaporation and their cosmological consequences
Relativistic accretion onto Kerr primordial black holes gives roughly 4.5x mass growth and fast spin-down, strengthening BBN bounds, lowering the survival mass to ~2.7e14 g, and erasing the high-frequency stochastic g...
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Probing Memory-Burdened Primordial Black Holes with Galactic Sources observed by LHAASO
LHAASO spectra of four Galactic sources are used to set upper limits on the abundance of memory-burdened primordial black holes lighter than 10^9 g.
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Hawking Radiation in $f(\mathcal{R})$ Gravity: Survival of lighter black holes
Non-rotating black holes in the studied f(R) model can survive to the present day down to masses ~5×10^13 g (for large |B|), roughly ten times lighter than the GR threshold.
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Relativistic accretion and burdened primordial black holes
Combining relativistic accretion with memory-burdened evaporation widens the parameter space for primordial black holes as dark matter and changes dark matter and dark radiation emission predictions.
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New bounds on Memory Burdened Primordial Black Holes from Big Bang Nucleosynthesis
Memory-burdened primordial black holes lighter than 10^9 grams are newly constrained by Big Bang nucleosynthesis, with a residual unconstrained window around 1-100 grams for suppression index k=2.
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