s-wave scattering of charged fermions by a magnetic black hole

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Abstract
We argue that, classically, s-wave electrons incident on a magnetically charged black hole are swallowed with probability one: The reflection coefficient vanishes. However, quantum effects can lead to both electromagnetic and gravitational backscattering. We show that, for the case of extremal, magnetically charged, dilatonic black holes and a single flavor of low-energy charged particles, this backscattering is described by a perturbatively computable and unitary S matrix, and that the Hawking radiation in these modes is suppressed near extremality. The interesting and much more diffiult case of several flavors is also discussed.
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