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Title:
Glimpses of black-hole formation/evaporation in ultra-planckian string collisions
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Abstract:
We revisit possible glimpses of black-hole production in ultra-planckian string collisions. We compare previous results by ACV, using the optical theorem, the resummation of ladder diagrams, and the AGK cutting rules, with recent study by at very high final-state multiplicity. We argue that some apparent tension between the two approaches disappears once the results by DGILS are reinterpreted in terms of suitably defined infrared-safe cross sections. Under that assumption, the typical final state produced in an ultra-planckian collision does indeed appear to share some properties with those expected from the evaporation of a black hole of mass $\sqrt{s}$, although no compelling sign of thermalization is seen to emerge at this level of approximation.
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