We argue that, as a consequence of the graviton’s spin-2, its bremsstrahlung in trans-Planckian-energy (E ≫ MP ) gravitational scattering at small deflection angle can be nicely expressed in terms of helicity- transformation phases and their transfer within the scattering process. The resulting spectrum exhibits deeply sub-Planckian characteristic energies of order M2 P=E ≪ MP (reminiscent of Hawking radiation), a suppressed fragmentation region, and a reduced rapidity plateau, in broad agreement with recent classical estimates.

Emerging Hawking-like radiation from gravitational bremsstrahlung beyond the planck scale / Ciafaloni, Marcello; Colferai, Dimitri; Veneziano, Gabriele. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 115:(2015), pp. 171301-171305. [10.1103/PhysRevLett.115.171301]

Emerging Hawking-like radiation from gravitational bremsstrahlung beyond the planck scale

CIAFALONI, MARCELLO;COLFERAI, DIMITRI;
2015

Abstract

We argue that, as a consequence of the graviton’s spin-2, its bremsstrahlung in trans-Planckian-energy (E ≫ MP ) gravitational scattering at small deflection angle can be nicely expressed in terms of helicity- transformation phases and their transfer within the scattering process. The resulting spectrum exhibits deeply sub-Planckian characteristic energies of order M2 P=E ≪ MP (reminiscent of Hawking radiation), a suppressed fragmentation region, and a reduced rapidity plateau, in broad agreement with recent classical estimates.
115
171301
171305
Ciafaloni, Marcello; Colferai, Dimitri; Veneziano, Gabriele
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/1075927
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