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Speaker |
Moretti, Valter |
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Coauthors |
Collini, G ; Moretti, V; Pinamonti, N |
| Talk Title |
On the so-called "tunnelling interpretation" of black hole radiation: The algebraic QFT viewpoint |
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Abstract |
"Tunnelling processes" through black hole horizons have been investigated in the framework of WKB theory, discovering an interesting interplay with Hawking radiation. We instead adopt the point of view of algebraic QFT in curved spacetime. Using a suitable scaling limit towards a Killing horizon we obtain the leading order of the correlation function relevant for the tunnelling. The computation is done for a certain large class of reference quantum states for scalar fields, including Hadamard states. In the limit of sharp localization on opposite sides of the horizon, the quantum correlation functions appear to have thermal nature with characteristic temperature given by Hawking's one. The approach is valid for stationary charged rotating non-extremal black holes and also covers the case of a Killing horizon which just temporarily exists in some finite region. These results provide strong support to the idea that the Hawking radiation is actually related to phenomena associated to local Killing horizons. Finally, the theory is applied to the model of a self-interaction in Rindler spacetime, and renormalization counterterms are computed, obtaining that Hawking radiation perturbatively survives the introduction of the interaction. |
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