Opening the Window of Ultra-Light PBHs by Exorcising the Poltergeist
Abstract
The hot Big Bang may have emerged from evaporation of primordial black holes (PBHs) lighter than 109g. Standard monochromatic treatments predict nearly simultaneous evaporation, abrupt reheating, and a large Poltergeist scalar-induced gravitational wave signal. We confront this expectation with the irreducible collapse mass tail predicted by general relativity, df PBH/d M M3.78, which smooths reheating, suppresses the signal by orders of magnitude, and reopens the ultra-light PBH window.
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