$δ$-Expansion at Finite Temperature

Details $δ$-Expansion at Finite Temperature $δ$-Expansion at Finite Temperature

1996-07-24

arxiv.org/abs/hep-ph/9607416v1

Braz.J.Phys. 26 (1996) 684-689

Physics

High Energy Physics

High Energy Physics - Phenomenology

plain LaTeX, 11 pages, to be published in Braz. Journ. Phys

Scientific paper

We apply the $\delta$-expansion perturbation scheme to the $\lambda \phi^{4}$ self-interacting scalar field theory in 3+1 D at finite temperature. In the $\delta$-expansion the interaction term is written as $\lambda (\phi^{2})^{ 1 + \delta}$ and $\delta$ is considered as the perturbation parameter. We compute within this perturbative approach the renormalized mass at finite temperature at a finite order in $\delta$. The results are compared with the usual loop-expansion at finite temperature.

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