Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-05-10
JHEP 0708:007,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 5 postscript figures
Scientific paper
10.1088/1126-6708/2007/08/007
We present a systematic semiclassical procedure to compute the partition function for scalar field theories at finite temperature. The central objects in our scheme are the solutions of the classical equations of motion in imaginary time, with spatially independent boundary conditions. Field fluctuations -- both field deviations around these classical solutions, and fluctuations of the boundary value of the fields -- are resummed in a Gaussian approximation. In our final expression for the partition function, this resummation is reduced to solving certain ordinary differential equations. Moreover, we show that it is renormalizable with the usual 1-loop counterterms.
Bessa A.
de Carvalho Carlos A. A.
Fraga Eduardo S.
Gelis Francois
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