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Relying solely on unitarity and the consistency with large-distance blackhole physics, we derive model-independent properties of the microscopic blackholes and of short-distance gravity in theories with N particle species. Inthis class of theories black holes can be as light as M_{Planck}/\sqrt{N} andbe produced in particle collisions above this energy. We show, that the microblack holes must come in the same variety as the species do, although theirlabel is not associated with any conserved charge measurable at largedistances. In contrast with big Schwarzschildian ones, the evaporation of thesmallest black holes is maximally undemocratic and is biased in favor ofparticular species. With an increasing mass the democracy characteristic to theusual macro black holes is gradually regained. The lowest possible mass abovewhich black holes become Einsteinian is \sqrt{N} M_{Planck}. This fact uncoversthe new fundamental scale (below the quantum gravity scale) above which gravitychanges classically, and the properties of black holes and gravity are such asif some extra dimensions open up, although no such input exists in the theory.Our observations indicate that geometry of space may be an emergent conceptfollowing from large number of species and the consistency with macro blackhole physics. We apply our findings to the phenomenological properties of themicro black holes that can be observed at LHC for large N. Extrapolating ourfindings to small N, one may ask whether the existence of quark and leptonflavors is already an evidence for emergent extra dimensions at shortdistances.

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