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marcus said:more about the black hole radiation spectrum

http://arxiv.org/abs/hep-th/0506214

Selection Rules for Black-Hole Quantum Transitions

Shahar Hod, Uri Keshet

4 pages, 2 figures

"We suggest that quantum transitions of black holes comply with selection rules, analogous to those of atomic spectroscopy. In order to identify such rules, we apply Bohr's correspondence principle to the quasinormal ringing frequencies of black holes. In this context, classical ringing frequencies with an asymptotically vanishing real part

[tex]\omega_R[/tex]

correspond to virtual quanta, and may thus be interpreted as forbidden quantum transitions. With this motivation, we calculate the quasinormal spectrum of neutrino fields in spherically symmetric black-hole spacetimes. It is shown that

[tex]\omega_R \rightarrow 0[/tex]

for these resonances, suggesting that the corresponding fermionic transitions are quantum mechanically forbidden."

Shahar Hod was who started the uproar about quasinormal vibration modes of black holes in the first place. He cites his own 1998 paper

Marcus this paper may be of great interest:http://uk.arxiv.org/abs/quant-ph/0506228

he thanks Rovelli and Smolin to name but two!

and this paper may/will? be of interest to the Hod paper:http://uk.arxiv.org/abs/quant-ph/0506231