Shear Viscosity in Weakly Coupled N-Component Scalar Field Theories
arXiv:1010.3121 · doi:10.1103/PhysRevD.83.115006
Abstract
The rich phenomena of the shear viscosity (eta) to entropy density (s) ratio, eta/s, in weakly coupled N-component scalar field theories are studied. eta/s can have a "double dip" behavior due to resonances and the phase transition. If an explicit goldstone mass term is added, then eta/s can either decrease monotonically in temperature or, as seen in many other systems, reach a minimum at the phase transition. We also show how to go beyond the original variational approach to make the Boltzmann equation computation of eta systematic.
22 pages, 2 figures
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