Leading Order QCD Shear Viscosity from the 3PI Effective Action
M.E. Carrington, E. Kovalchuk
TL;DR
This paper calculates the leading order shear viscosity in QCD using a resummed 3PI effective action at 3-loop order, naturally deriving integral equations for key contributions without power counting.
Contribution
It introduces a method to compute shear viscosity in QCD at leading order via the 3PI effective action, including all relevant terms without additional assumptions.
Findings
Derived integral equations for shear viscosity contributions
Included all leading order terms without power counting
Validated the 3PI formalism for QCD transport coefficients
Abstract
In this article we calculate the leading order shear viscosity in QCD using the resummed 3PI effective action. We work to 3-loop order in the effective action. We show that the integral equations that resum the pinching and collinear contributions are produced naturally by the formalism. All leading order terms are included, without the need for any kind of power counting arguments.
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