Micro Black Holes and the Democratic Transition

Understand

Unitarity implies that the evaporation of microscopic quasi-classical black holes cannot be universal in different particle species.

• This creates a puzzle, since it conflicts with the thermal nature of quasi-classical black holes, according to which all the species should see the same horizon and be produced with the same Hawking temperatures.
• We resolve this puzzle by showing that for the microscopic black holes, on top the usual quantum evaporation time, there is a new time-scale which characterizes a purely classical process during which the black hole looses the ability to differentiate among the species, and becomes democratic.
• We demonstrate this phenomenon in a well-understood framework of large extra dimensions, with a number of parallel branes.