2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/198591Relying on the Luttinger-Ward theorem we derive a thermodynamically selfconsistent and scale independent approximation of the thermodynamic potential for the scalar $ϕ^4$ theory in the tadpole approximation. The resulting thermodynamic potential as a function of the temperature is similar to the one of the recently proposed screened perturbation theory.6 pages, including 1 eps figureHigh Energy Physics - Phenomenologytext