δ-Expansion at Finite Temperature

1996/07/24 by Rudnei O. Ramos
Physics and Astronomy · #hep-ph

paper · pdf

published as Braz.J.Phys. 26 (1996) 684-689 · plain LaTeX, 11 pages, to be published in Braz. Journ. Phys

arxiv created 1996/07/24 · arxiv updated 2009/11/30

Abstract

We apply the δ-expansion perturbation scheme to the λϕ⁴ self-interacting scalar field theory in 3+1 D at finite temperature. In the δ-expansion the interaction term is written as λ(ϕ²) ^{1 + δ} and δ is considered as the perturbation parameter. We compute within this perturbative approach the renormalized mass at finite temperature at a finite order in δ. The results are compared with the usual loop-expansion at finite temperature.

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