Stochastic Evolution of Primordial Black Holes to near-extremality in EFTs of Gravity

Abstract

The search for dark matter candidates includes primordial black holes (PBHs) as possible constituents. Recent studies show that some PBHs can survive to the present epoch by gaining angular momentum through Hawking radiating photons and becoming extremal before complete evaporation. While this provides a plausible model in a two-derivative theory of gravity, additional issues arise in EFT-corrected theories of gravity. In such theories, a rapidly spinning black hole can lead to extremely high tidal forces on a near-horizon observer, with possible observational consequences. In this work, by modeling Hawking radiation as a biased random walk within an EFT of gravity, we show that nearly the same fraction of PBHs survives as in GR. We argue that the resultant near horizon tidal effects should be detectable in future gravitational-wave observables.

7 pages, 3 figures. v2: Published Version

References in corpus (8)

• Primordial Black Holes as Dark Matter: Recent Developments
• Primordial Black Holes as Dark Matter Candidates
• Black Holes, Information, and Hilbert Space for Quantum Gravity
• Extremal Kerr black holes as amplifiers of new physics
• Updated Constraints on Primordial Black Hole Evaporation
• Sudden breakdown of effective field theory near cool Kerr-Newman black holes
• Off-shell extended graphic rule and the expansion of Berends-Giele currents in Yang-Mills theory
• Heavy Fields and Gravity