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SUMMARY:Hawking-like radiation and “temperature” in gravitational scat
 tering beyond the Planck scale - Dimitri Colferai\, INFN\, Florence
DTSTART:20180302T160000Z
DTEND:20180302T170000Z
UID:TALK98893@talks.cam.ac.uk
CONTACT:Francesco Coradeschi
DESCRIPTION:I will show how to construct a unitary S-matrix for\nparticle 
 collisions at transplanckian energies\, where the\nformation of a black ho
 le is expected on classical grounds\,\nthus hinting a path towards the res
 olution of the information paradox.\nWithin the effective diagrams approac
 h by Amati-Ciafaloni-Veneziano\nand by devising an improved vertex for rea
 l graviton emission\,\nwe resum emission diagrams to all orders and derive
  the spectrum\nof gravitational bremsstrahlung.\nThis spectrum has very pe
 culiar and interesting properties. In fact\,\nthe average energy of emitte
 d gravitons decreses at\nincreasing center-of-mass energies\, in a way res
 embling Hawking's radiation. Furthermore the spectrum suffers an exponenti
 al\ndecay ~exp(-omega/T) with a "quasi-temperature" of the order of Hawkin
 g's\ntemperature T_H.
LOCATION:MR3\, CMS (downstairs in Central Core)
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