High-energy gravitational scattering and black hole resonances

Details High-energy gravitational scattering and black hole resonances High-energy gravitational scattering and black hole resonances

2007-11-30

arxiv.org/abs/0711.5012v2

Phys.Rev.D77:085025,2008

Physics

High Energy Physics

High Energy Physics - Theory

22 pages, harvmac. v2: minor corrections

Scientific paper

10.1103/PhysRevD.77.085025

Aspects of super-planckian gravitational scattering and black hole formation are investigated, largely via a partial-wave representation. At large and decreasing impact parameters, amplitudes are expected to be governed by single graviton exchange, and then by eikonalized graviton exchange, for which partial-wave amplitudes are derived. In the near-Schwarzschild regime, perturbation theory fails. However, general features of gravitational scattering associated with black hole formation suggest a particular form for amplitudes, which we express as a black hole ansatz. We explore features of this ansatz, including its locality properties. These amplitudes satisfy neither the Froissart bound, nor apparently the more fundamental property of polynomial boundedness, through which locality is often encoded in an S-matrix framework. Nevertheless, these amplitudes do satisfy a macroscopic form of causality, expressed as a polynomial bound for the forward-scattering amplitude.

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