Transient Pulses from Exploding Primordial Black Holes as a Signature of an Extra Dimension

Understand

An evaporating black hole in the presence of an extra spatial dimension would undergo an explosive phase of evaporation.

• We show that such an event, involving a primordial black hole, can produce a detectable, distinguishable electromagnetic pulse, signaling the existence of an extra dimension of size $L\sim10^{-18}-10^{-20}$ 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 extra dimension, transient radio-pulse searches probe the electroweak energy scale ($\sim$0.1 TeV), enabling comparison with the Large Hadron Collider.