"Early Time Dynamics in Heavy Ion Collisions from AdS/CFT Correspondence"

Presented by Yuri Kovchegov, Ohio State University

Friday, December 14, 2007, 2:00 pm — Small Seminar Room, Bldg. 510

We study the matter produced in heavy ion collisions assuming that
this matter is strongly interacting and employing AdS/CFT
correspondence to investigate its dynamics. At late proper times
tau we show that Bjorken hydrodynamics solution, obtained
recently by Janik and Peschanski using gauge-gravity duality, can be
singled out by simply requiring that the
metric tensor is a real and single-valued function of the
coordinates everywhere in the bulk, without imposing any constraints
on the curvature invariant. At early proper times we use similar
strategy to show that the energy density epsilon approaches a
constant as tau -> 0. We therefore demonstrate that the
strong coupling dynamics incorporates the isotropization transition
in heavy ion collisions. By matching our early-time regime with the
late-time one of Janik and Peschanski we estimate the isotropization
time at RHIC to be approximately 0.3 fm/c, in good agreement with
results of hydrodynamic
simulations.