Heidelberg 2007 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 404: Schwarze Löcher

GR 404.4: Talk

Thursday, March 8, 2007, 16:00–16:15, KIP Kl. HS

Listening to the interior of a Black Hole? — •Alexander Vikman — LMU-ASC, LS Prof. Mukhanov, Theresienstr. 37, 80333 München, Deutschland

We show that if there exists a special kind of Born-Infeld like scalar field, then one can send information from inside a black hole. This information is encoded in perturbations of the field propagating in non-trivial dynamical scalar field backgrounds, which serves as a "new ether". Although the theory is manifestly Lorentz-invariant, it allows, nevertheless, the superluminal propagation of perturbations with respect to the "new ether". We found a stable solution for background, which describes the stationary spherically symmetric accretion of the scalar field onto a black hole. Examining the propagation of small perturbations around this solution we show that the signals emitted inside the Schwarzschild horizon can reach an observer located outside the black hole. However, there exists an acoustic horizon which separates a region from which information cannot escape. Thus the accreting field forms a hydrodynamical analog of a black hole whose horizon is inside of the gravitational black hole drawing in the scalar field. At the end of the talk the Hawking radiation of phonons (perturbations around this background) and thermodynamics of the system will be discussed.

This talk is based on our work: Escaping from the black hole? E. Babichev (Munich, Max Planck Inst.), Viatcheslav F. Mukhanov, (Munich U.) A. Vikman (Munich U.) JHEP 0609:061,2006. e-Print Archive: hep-th/0604075