Hawking-like radiation and “temperature” in gravitational scattering beyond the Planck scale

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• Dimitri Colferai, INFN, Florence
• Friday 02 March 2018, 16:00-17:00
• MR3, CMS (downstairs in Central Core).

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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