4.7 Article

Bound states and decay times of fermions in a Schwarzschild black hole background

Journal

PHYSICAL REVIEW D
Volume 72, Issue 10, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.72.105014

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We compute the spectrum of normalizable fermion bound states in a Schwarzschild black hole background. The eigenstates have complex energies. The real parts of the energies, for small couplings, closely follow a hydrogenlike spectrum. The imaginary parts give decay times for the various states, due to the absorption properties of the hole, with states closer to the hole having shorter half-lives. As the coupling increases, the spectrum departs from that of the hydrogen atom, as states close to the horizon become unfavorable. Beyond a certain coupling the 1S(1/2) state is no longer the ground state, which shifts to the 2P(3/2) state, and then to states of successively greater angular momentum. For each positive energy state a negative energy counterpart exists, with opposite sign of its real energy, and the same decay factor. It follows that the Dirac sea of negative energy states is decaying, which may provide a physical contribution to Hawking radiation.

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