Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-04-11
JHEP 0105:039,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, including 9 figures. Error in vacuum self-energy, arising from trusting Arthur Weldon, fixed, thank you Tony Rebhan.
Scientific paper
10.1088/1126-6708/2001/05/039
We compute shear viscosity and flavor diffusion coefficients for ultra-relativistic gauge theory with many fermionic species, Nf >> 1, to leading order in 1/Nf. The calculation is performed both at leading order in the effective coupling strength g^2 Nf, using the Hard Thermal Loop (HTL) approximation, and completely to all orders in g^2 Nf. This constitutes a nontrivial test of how well the HTL approximation works. We find that in this context, the HTL approximation works well wherever the renormalization point sensitivity of the leading order HTL result is small.
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