2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/214532A variational method is studied based on the minimum of energy variance. The method is tested on exactly soluble problems in quantum mechanics, and is shown to be a useful tool whenever the properties of states are more relevant than the eigenvalues. In quantum field theory the method provides a consistent second order extension of the gaussian effective potential.5 ps figuresHigh Energy Physics - Phenomenologytext