Transient pulses from exploding primordial black holes as a signature of an extradimension

Abstract

An evaporating black hole in the presence of an extra spatial dimension wouldundergo an explosive phase of evaporation. We show that such an event,involving a primordial black hole, can produce a detectable, distinguishableelectromagnetic pulse, signaling the existence of an extra dimension of sizeL∼10−18–10−20 m. We derive a generic relationship between the Lorentz factor of a pulse-producing‘fireball’ and the TeV energy scale. For an ordinary toroidally compactified extradimension, transient radio-pulse searches probe the electroweak energy scale(∼0.1 TeV), enabling comparison with the Large Hadron Collider.