QED Thermodynamics at Intermediate Coupling

Details QED Thermodynamics at Intermediate Coupling QED Thermodynamics at Intermediate Coupling

2009-10-20

arxiv.org/abs/0910.3860v1

Acta Phys.Polon.Supp.3:727-734,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 3 figures, Proceedings contribution to "Three Days of Strong Interactions", Wroclaw (Poland), July 2009

Scientific paper

We discuss reorganizing finite temperature perturbation theory using hard-thermal-loop (HTL) perturbation theory in order to improve the convergence of successive perturbative approximations to the free energy of a gauge theory. We briefly review the history of the technique and present new results for the three-loop HTL-improved approximation for the free energy of QED. We show that the hard-thermal-loop perturbation reorganization improves the convergence of the successive approximations to the QED free energy at intermediate coupling, e ~ 2. The reorganization is gauge invariant by construction, and due to cancellation among various contributions, one can obtain a completely analytic result for the resummed thermodynamic potential at three loops.

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