Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-02-20
Phys.Lett. B401 (1997) 69-73
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, LaTex, 2 figures
Scientific paper
10.1016/S0370-2693(97)00392-4
A new perturbative scheme is proposed for the evaluation of the free energy density of field theories at finite temperature. The screened loop expansion takes into account exactly the phenomenon of screening in thermal propagators. The approach is tested in the N-component scalar field theory at 2-loop level and also at 3-loop in the large N limit. The perturbative series generated by the screened loop expansion shows much better numerical convergence than previous expansions generated in powers of the quartic coupling.
Karsch Frithjof
Patkos Andras
Petreczky Peter
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