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Résumé |
In this talk, I show that the Ising model CFT can be used to obtain
some surprising insights into 3D (quantum) gravity with matter. I
review arguments for the existence of its holographic description, and
analyze the time dependence of perturbations of the theory at high
temperature, which would correspond to throwing matter into a black
hole in the dual gravitational picture. After an initial exponential
damping - consistent with absorption by the black hole - the signal
remarkably reemerges intact again, apparently at odds with the
expected conventional black hole behaviour. Using the exact
solvability of the Ising model CFT, I provide an explanation of this
phenomenon in terms of the properties of bulk matter fields
interacting with the BTZ black hole. This is made possible by the fact
that the geometry/metric is not fundamental but a derived quantity in
the Chern-Simons formulation of 3D gravity, which allows for evading a
variant of the black hole information paradox in the present context.
I argue that the observed mechanism should be generic in the AdS3/CFT2
context and should apply for any CFT2. I also briefly mention some
work in progress.
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