Speaker
Andrea Addazi
(UNIVAQ, LNGS INFN)
Description
We revisit possible glimpses of black-hole formation by
looking at trans-planckian string-string collisions at very
high final-state multiplicity. We compare, in particular,
previous results using the optical theorem, the resummation
of ladder diagrams at arbitrary loop order, and the AGK
cutting rules, with the more recent study of 2 → N
scatterings. We argue that some apparent tension between the
two approaches disappears once a reinterpretation of the
results in the latter approach is adopted. Under that
assumption, the typical final state produced in a highly trans-
planckian collision does indeed appear to share some
properties with those expected from the evaporation of a
black hole of mass √s, although no sign of
thermalization is seen to emerge at this level of approximation.
