Hawking-like radiation and “temperature” in gravitational scattering beyond the Planck scale
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If you have a question about this talk, please contact Francesco Coradeschi.
I will show how to construct a unitary S-matrix for
particle collisions at transplanckian energies, where the
formation of a black hole is expected on classical grounds,
thus hinting a path towards the resolution of the information paradox.
Within the effective diagrams approach by Amati-Ciafaloni-Veneziano
and by devising an improved vertex for real graviton emission,
we resum emission diagrams to all orders and derive the spectrum
of gravitational bremsstrahlung.
This spectrum has very peculiar and interesting properties. In fact,
the average energy of emitted gravitons decreses at
increasing center-of-mass energies, in a way resembling Hawking’s radiation. Furthermore the spectrum suffers an exponential
decay ~exp(-omega/T) with a “quasi-temperature” of the order of Hawking’s
temperature T_H.
This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.
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