S-Wave Scattering of Charged Fermions by a Magnetic Black Hole

Details S-Wave Scattering of Charged Fermions by a Magnetic Black Hole S-Wave Scattering of Charged Fermions by a Magnetic Black Hole

1992-02-21

arxiv.org/abs/hep-th/9202075v1

Phys.Rev.Lett.69:563-566,1992

Physics

High Energy Physics

High Energy Physics - Theory

9pp

Scientific paper

10.1103/PhysRevLett.69.563

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 difficult case of several flavors is also discussed.

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