Primordial Black Hole mass growth from neutrinos during the radiation era
astro-ph.CO, hep-th
Submitted: 2026-07-10
Updated: 2026-09-25
Comments: 5 pages of main text, 9 pages total, 4 figures
License: http://creativecommons.org/licenses/by/4.0/
The gist: We present a new picture of primordial black holes mass evolution through neutrino absorption.
Terminology
Abstract
We present a new picture of primordial black holes mass evolution through neutrino absorption. Using semi-classical approach and a closer look at the kinetic of the early plasma we revisit the thermal absorption of radiation by a population of primordial black holes ranging from 10-3-10 9 M embedded in a thermal bath. We find significant mass growth of intermediate mass and supermassive PBHs, the effect shift the predicted e+e- peak from thermal history. Depending on the value of the collapse fraction an additional peak around the intermediate mass range, might become significant. Moreover, because PBH grow from the thermal bath the fraction of DM in PBH f PBH also change. These results revise the previous view on mass evolution of PBH and have implications for dark matter PBH observations.
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