Singlet Majoron model with hidden scale invariance
Abstract
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 dilaton field. Starting from the oneloop 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 JordanBransDicke 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 τ neutrino is sufficiently heavy.
 Publication:

Physical Review D
 Pub Date:
 January 1994
 DOI:
 10.1103/PhysRevD.49.730
 arXiv:
 arXiv:hepph/9301235
 Bibcode:
 1994PhRvD..49..730R
 Keywords:

 98.80.Cq;
 11.15.Ex;
 Particletheory and fieldtheory models of the early Universe;
 Spontaneous breaking of gauge symmetries;
 High Energy Physics  Phenomenology
 EPrint:
 22 pages, SISSA5/93/A and DFPD/93/TH/03