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BARYON ASYMMETRY, SUPERSYMMETRY AND GRAVITATIONAL ANOMALIES *
Author(s) -
Ibánetz Luis E.,
Quevedo Fernando
Publication year - 1993
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.1993.tb43923.x
Subject(s) - physics , baryon asymmetry , particle physics , supersymmetry , baryon , baryon number , context (archaeology) , neutrino oscillation , electroweak interaction , instanton , lepton , neutrino , theoretical physics , quantum mechanics , paleontology , biology , electron
We discuss two independent issues about the baryon asymmetry of the universe.First, assuming that it is generated by an unspecified source at hightemperatures, we study the effects of non-perturbative $SU(2)_W$ dynamics abovethe electroweak scale, in the context of supersymmetric models. We find thatthere is a substantial difference with the nonsupersymmetric case with the neteffect of relaxing previous bounds on B and L violating interactions. Inparticular supersymmetry allows neutrino masses as large as 10 eV (preferred bysolar neutrino and COBE data and measurable at future neutrino oscillationexperiments). Second, we argue that the existence of a mixed leptonnumber-gravitational anomaly in the standard model will induce B-L violatinginteractions. These transitions would be catalized by Einstein-Yang-Millsinstantons or sphalerons and could create a primordial B-L asymmetry at Plancktemperatures or lower. Gravity (and the anomaly structure of the standardmodel) could then be the ultimate source of the baryon asymmetry. We analyzethe viability of the presently known gravitational instantons and sphalerons torealize this scenario. (Talk presented by FQ at the Texas/Pascos Conference,Berkeley Dec.1992.)Comment: 8 pages,FTUAM-93-07 NEIP93-001, harvma