Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-11-28
Braz.J.Phys.37:762-765,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 4 figures; v2 one reference added, small changes to text; Proceedings contribution for the International Symposium on
Scientific paper
10.1590/S0103-97332007000500021
I discuss the physics of non-Abelian plasmas which are locally anisotropic in momentum space. Such momentum-space anisotropies are generated by the rapid longitudinal expansion of the matter created in the first 1 fm/c of an ultrarelativistic heavy ion collision. In contrast to locally isotropic plasmas anisotropic plasmas have a spectrum of soft unstable modes which are characterized by exponential growth of transverse chromo-magnetic/-electric fields at short times. This instability is the QCD analogue of the Weibel instability of QED. Parametrically the chromo-Weibel instability provides the fastest method for generation of soft background fields and dominates the short-time dynamics of the system. The existence of the chromo-Weibel instability has been proven using diagrammatic methods, transport theory, and numerical solution of classical Yang-Mills fields. I review the results obtained from each of these methods and discuss the numerical techniques which are being used to determine the late-time behavior of plasmas subject to a chromo-Weibel instability.
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