Black hole remnants and the information puzzle

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Abstract
Magnetically charged dilatonic black holes have a perturbatively infinite ground-state degeneracy associated with an infinite-volume throat region of the geometry. A simple argument based on causality is given that these states do not have a description as ordinary massive particles in a low-energy effective field theory. Pair production of magnetic black holes in a weak magnetic field is estimated in a weakly coupled semiclassical expansion about an instanton and found to be finite, despite the infinite degeneracy of states. This suggests that these states may store the information apparently lost in black hole scattering processes.

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