Hard-Loop Dynamics of Non-Abelian Plasma Instabilities

Abstract

Non-Abelian plasma instabilities may be responsible for the fast apparent quark-gluon thermalization in relativistic heavy-ion collisions if their exponential growth is not hindered by nonlinearities. We study the real-time evolution of instabilities in an anisotropic non-Abelian plasma with an SU(2) gauge group in the hard-loop approximation. We find exponential growth of non-Abelian plasma instabilities both in the linear and in the strongly nonlinear regime, with only a brief phase of subexponential behavior in between.Comment: 4 pages REVTEX4, 3 figures; updated to match version published in Phys. Rev. Lett. (shorter introduction, added details on quality of numerical simulation