1993/01/13 by Antonio Riotto
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.49.730
published as Phys.Rev. D49 (1994) 730-738 · 22 pages, SISSA-5/93/A and DFPD/93/TH/03
arxiv created 1993/01/13 · openalex publication_date 1994/01/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate an extension of the singlet Majoron model in which the breaking of dilatation symmetry by the mass parameters of the scalar potential is removed by means of a dilation field. Starting from the one-loop renormalization group improved potential, we discuss the ground state of the theory. The flat direction in the classical potential is lifted by quantum corrections and the true vacua are found. Studying the finite temperature potential, we analyze the cosmological consequences of a Jordan-Brans-Dicke dilaton and show that the lepton number is spontaneously broken after the electroweak phase transition, thus avoiding any constraint coming from the requirement of the preservation of the baryon asymmetry in the early Universe. We also find that, contrary to the standard model case, the dilaton and/or neutrino cosmology do not impose any upper bound on the scale of the spontaneous breaking of scale invariance if the \ensuremathτ neutrino is sufficiently heavy.