Nature of Microscopic Black Holes and Gravity in Theories with Particle Species

Understand

Relying solely on unitarity and the consistency with large-distance black hole physics, we derive model-independent properties of the microscopic black holes and of short-distance gravity in theories with N particle species.

• In this class of theories black holes can be as light as M_{Planck}/\sqrt{N} and be produced in particle collisions above this energy.
• We show, that the micro black holes must come in the same variety as the species do, although their label is not associated with any conserved charge measurable at large distances.
• In contrast with big Schwarzschildian ones, the evaporation of the smallest black holes is maximally undemocratic and is biased in favor of particular species.