Hawking-Radiation Recoil of Microscopic Black Holes

Understand

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 $\approx 10^{-70}\mbox{m}^2$, 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 $\approx 10^{-1} c$.