2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178608The massless conformally coupled scalar field is characterized by the so-called "new improved stress-energy tensor", which is capable of classically violating the null energy condition. When coupled to Einstein gravity we find a three-parameter class of exact solutions. These exact solutions include the Schwarzschild geometry, assorted naked singularities, and a large class of traversable wormholes.11 Pages, plain LaTeX2e, uses graphics.sty, three *.eps figuresGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext