Publication details

Hawking-radiation recoil of microscopic black holes



Year of publication 2021
Type Article in Periodical
Magazine / Source Physics of the Dark Universe
MU Faculty or unit

Faculty of Science

Keywords Black hole evaporation; Dark matter; Quantum gravity phenomenology
Description Hawking radiation would make microscopic black holes evaporate rapidly, which excludes them from many astrophysical considerations. However, it has been argued that the quantum nature of space would alter this behaviour: the temperature of a Planck-size black hole vanishes, and what is left behind is a Planck-mass remnant with the cross-section of approximate to 10(-70) m(2), which makes a direct observation nearly impossible. Such black hole remnants have been identified as possible dark matter candidates. Here, we argue that the final stage of evaporation has a recoil effect that gives them a velocity up to approximate to 10(-1)c. This would lead to a disagreement with the cold dark matter cosmological model unless the primordial black hole formation ceased shortly after the inflation era.
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