Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-16
Phys.Rev.D81:065017,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 18 figures. Added references and minor rewordings: published version
Scientific paper
10.1103/PhysRevD.81.065017
Transport coefficients can be obtained from 2-point correlators using the Kubo formulae. It has been shown that the full leading order result for electrical conductivity and (QCD) shear viscosity is contained in the re-summed 2-point function that is obtained from the 3-loop 3PI re-summed effective action. The theory produces all leading order contributions without the necessity for power counting, and in this sense it provides a natural framework for the calculation. In this article we study the 4-loop 4PI effective action for a scalar theory with cubic and quartic interactions in the presence of spontaneous symmetry breaking. We obtain a set of integral equations that determine the re-summed 2-point vertex function. A next-to-leading order contribution to the viscosity could be obtained from this set of coupled equations.
Carrington Magaret E.
Kovalchuk Evgeny
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