Séminaire / Seminar GReCO |
| « Black hole perturbation theory, the area quantum and large extra dimensions » |
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Emanuele Berti |
| Bekenstein suggested in the seventies that, in any quantum theory of gravity, black hole area should be quantized, and the area spectrum be equally spaced. Hod recently proposed to use Bohr''s correspondence principle to infer the spacing in the area spectrum from highly-damped, classical black hole oscillation frequencies. Last year Dreyer showed that Hod''s conjecture can be used to fix an undetermined parameter appearing in Loop Quantum Gravity. In the first part of my talk I will discuss recent progress in understanding the generality of Hod''s proposal. The conjecture seems to apply to non-rotating black holes in any dimension. However, its validity for non-asimptotically flat, charged and/or rotating black holes is still an open question. In the second part of the talk I will discuss possible applications of black hole perturbation theory to large-extra dimension scenarios. If the fundamental Planck scale is of order of a TeV, mini-black holes may be produced in cosmic rays or at LHC. These mini black-holes will first emit classical fields in the so-called balding phase, and then evaporate emitting Hawking radiation. Black hole perturbation theory has recently been extended to D dimensions. Such an extension is an important tool to evaluate gravitational wave emission in the bulk during the balding phase - and eventually, to constrain the number and/or size of the extra dimensions. |
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jeudi 30 octobre 2003 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |