Critical Temperature for the $\LAMBDA (\PHI^{4})_{4}$ Theory within the $\DELTA$ -Expansion

Rudnei O. Ramos

We apply the $\delta$-expansion perturbation scheme to the $\lambda {\varphi }_4$ self-interacting scalar field theory in 3+1 D at finite temperature. In the $\delta$-expansion the interaction term is wri…