Next-to-Leading Order Shear Viscosity in lambda phi^4 Theory
arXiv:0706.3692 · doi:10.1103/PhysRevD.76.107702
Abstract
We show that the shear viscosity of lambda phi^4 theory is sensitive at next-to-leading order to soft physics, which gives rise to subleading corrections suppressed by only a half power of the coupling, eta = [3033.54 + 1548.3 m_{th}/T] N T^3]/[ (N+2)/3 lambda^2], with m^2_th=(N+2)/72 lambda T^2. The series appears to converge about as well (or badly) as the series for the pressure.
4 pages, 1 figure. Typos fixed, tiny change in discussion