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

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

2002-09-24

arxiv.org/abs/gr-qc/0209090v2

Phys.Rev.D72:105014,2005

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

27 pages, 14 figures, fully revised version

Scientific paper

10.1103/PhysRevD.72.105014

We compute the spectrum of normalizable fermion bound states in a Schwarzschild black hole background. The eigenstates have complex energies. The real part of the energies, for small couplings, closely follow a hydrogen-like 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 unfavourable. Beyond a certain coupling the 1S1/2 state is no longer the ground state, which shifts to the 2P3/2 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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