U(1)_B-L: Neutrino Physics and Inflation

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dc.creatorSenoguz, V. N.
dc.creatorShafi, Q.
dc.date2005-12-13
dc.date.accessioned2026-07-07T06:54:14Z
dc.date.available2026-07-07T06:54:14Z
dc.descriptionA gauged U(1)_B-L symmetry predicts three right handed handed neutrinos and its spontaneous breaking automatically yields the seesaw mechanism. In a supersymmetric setting this breaking can be nicely linked with inflation to yield deltaT/ T proportional to (M_B-L / M_P)^2, where M_B-L (M_P) denote the B-L breaking (Planck) scale. Thus M_B-L is estimated to be of order 10^16 GeV, and the heaviest right handed neutrino mass is less than or of order 10^14 GeV. A second right handed neutrino turns out to have a mass of order 10-10^2 T_r, where T_r (<~10^9 GeV) denotes the reheat temperature. A U(1) R symmetry plays an essential role in implementing inflation and leptogenesis, resolving the MSSM mu problem and eliminating dimension five nucleon decay. An unbroken Z_2 subgroup plays the role of matter parity. The scalar spectral index n_s=0.99+-0.01 for the simplest models, while in smooth hybrid inflation n_s>=0.97. The tensor to scalar ratio r is negligible, and dn_s/dlnk<~10^-3.
dc.descriptionBased on talks given by Q. Shafi at Planck 03, 11th International Workshop on Neutrino Telescopes, and PASCOS 2005. 9 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0512170
dc.identifierhttp://arxiv.org/abs/hep-ph/0512170
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/105866
dc.subjectHigh Energy Physics - Phenomenology
dc.titleU(1)_B-L: Neutrino Physics and Inflation
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