HUBerlin_280115Black Hole Formation and Classicalization in Trans-Planckian Scattering

Abstract:
Recently, Dvali and Gomez proposed a mechanism called classicalization to render
tree level gravitational scattering at (trans)-Planckian energies unitary through the formation
of black holes. In this talk, I will investigate this proposal by establishing a
direct connection between gravitational scattering amplitudes at high energies and
unitarization by black hole formation. The main guideline for this will be an
explicit microscopic theory of black holes in terms of a Bose-Einstein condensate of
gravitons. I will explain which scattering amplitudes are relevant for making the
connection precise and how to compute them efficiently relying on modern amplitude
technology. In doing so, it will be seen that graviton scattering amplitudes exhibit
key features of classicalization and the quantum reason for the dominance of black
hole production will be identified.