Hard thermal effective action in QCD through the thermal operator

Abstract

Through the application of the thermal operator to the zero temperature retarded Green's functions, we derive in a simple way the well known hard thermal effective action in QCD. By relating these functions to forward scattering amplitudes for on-shell particles, this derivation also clarifies the origin of important properties of the hard thermal effective action, such as the manifest Lorentz and gauge invariance of its integrand.

6 pages, contribution of the quarks to the effective action included and one reference added, version to be published in Phys. Rev. D

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Cited by in corpus (2)

• Bogoliubov transformation and the thermal operator representation in the real time formalism
• Thermal Operator and Dispersion Relation in QED at Finite Temperature and Chemical Potential