Volume 314 - The European Physical Society Conference on High Energy Physics (EPS-HEP2017) - Quantum Field and String Theory (Parallel Session). Conveners: Massimo Bianchi; Aleksi Vuorinen. Scientific Secretary: Luca Martucci.
Radiation enhancement and ``temperature'' in the collapse regime of gravitational scattering
D. Colferai* and M. Ciafaloni
*: corresponding author
Full text: pdf
Pre-published on: October 19, 2017
Published on: March 20, 2018
Abstract
We generalize the semiclassical treatment of graviton radiation to
gravitational scattering at very large energies smP and finite
scattering angles Θs, so as to approach the collapse regime of impact
parameters bbcR2Gs. Our basic tool is the
extension of the recently proposed, unified form of radiation to the ACV
reduced-action model and to its resummed-eikonal exchange. By superimposing
that radiation all-over eikonal scattering, we are able to derive the
corresponding (unitary) coherent-state operator. The resulting graviton
spectrum, tuned on the gravitational radius R, fully agrees with previous
calculations for small angles Θs1 but, for sizeable angles
Θs(b)Θc=O(1) acquires an exponential cutoff of the
large ωR region, due to energy conservation, so as to emit a finite
fraction of the total energy. In the approach-to-collapse regime of
bb+c we find a radiation enhancement due to large tidal forces, so
that the whole energy is radiated off, with a large multiplicity
NGs1 and a well-defined frequency cutoff of order R1.
The latter corresponds to the Hawking temperature for a black hole of mass
notably smaller than s.
DOI: https://doi.org/10.22323/1.314.0540
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