Hard-thermal-loop QED thermodynamics

Details Hard-thermal-loop QED thermodynamics Hard-thermal-loop QED thermodynamics

2009-11-24

arxiv.org/abs/0911.4601v1

Chin.Phys.C34:1527-1529,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 3 figures. Talk given at "The 5-th International Conference on Quarks and Nuclear Physics", September 21-26, 2009, Be

Scientific paper

10.1088/1674-1137/34/9/091

The weak-coupling expansion for thermodynamic quantities in thermal field theories is poorly convergent unless the coupling constant is tiny. We discuss the calculation of the free energy for a hot gas of electrons and photons to three-loop order using hard-thermal-loop perturbation theory (HTLpt). We show that the hard-thermal-loop perturbation reorganization improves the convergence of the successive approximations to the QED free energy at large coupling, e ~ 2. The reorganization is gauge invariant by construction, and due to the cancellations among various contributions, we obtain a completely analytic result for the resummed thermodynamic potential at three loops.

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