Viscosities of Quark-Gluon Plasmas

Details Viscosities of Quark-Gluon Plasmas Viscosities of Quark-Gluon Plasmas

1994-01-22

arxiv.org/abs/hep-ph/9401309v1

Phys.Rev. D49 (1994) 4739-4750

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages + 6 figures, report LBL-34929

Scientific paper

10.1103/PhysRevD.49.4739

The quark and gluon viscosities are calculated in quark-gluon plasmas to leading orders in the coupling constant by including screening. For weakly interaction QCD and QED plasmas dynamical screening of transverse interactions and Debye screening of longitudinal interactions controls the infrared divergences. For strongly interacting plasmas other screening mechanisms taken from lattice calculations are employed. By solving the Boltzmann equation for quarks and gluons including screening the viscosity is calculated to leading orders in the coupling constant. The leading logarithmic order is calculated exactly by a full variational treatment. The next to leading orders are found to be very important for sizable coupling constants as those relevant for the transport properties relevant for quark-gluon plasmas created in relativistic heavy ion collisions and the early universe.

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