Allés, B.Tarrach, R., 1948-2010-05-062010-05-0619860556-2821https://hdl.handle.net/2445/12430We study the possibility that a field theory is interacting and bounded only above a certain temperature, while not existing below it. Within the Gaussian variational approximation used we find a phase for λ φ 4 in four dimensions in which this phenomenon occurs.8 p.application/pdfeng(c) The American Physical Society, 1986Teoria de camps (Física)Partícules (Física nuclear)Field theory (Physics)Particles (Nuclear physics)info:eu-repo/semantics/article14163info:eu-repo/semantics/openAccess