Common Origin for CP Violation in Cosmology and in Neutrino Oscillations
| dc.creator | Babu, K. S. | |
| dc.creator | Meng, Yanzhi | |
| dc.creator | Tavartkiladze, Zurab | |
| dc.date | 2008-12-23 | |
| dc.date | 2008-12-23 | |
| dc.date.accessioned | 2026-07-07T12:21:25Z | |
| dc.date.available | 2026-07-07T12:21:25Z | |
| dc.description | We suggest predictive scenarios for neutrino masses which provide a common origin for CP violation in early universe cosmology and in neutrino oscillations. Our setup is the seesaw mechanism in the context of MSSM with two quasi-degenerate right-handed neutrinos, with baryon asymmetry generated via resonant leptogenesis. Three different models are found with specific textures in the Yukawa coupling matrices, each with a single phase which controls leptogenesis and neutrino CP violation. One model leads to normal hierarchy of light neutrino masses and the prediction tan theta_13 = sin theta_12 \sqrt{m_2/m_3}, resulting in a value of the reactor mixing angle theta_13 very close to the current experimental lower limit. The other two models predict inverted hierarchical neutrino mass spectrum with the sum rules sin^2 theta_12 = 1/2-tan theta_23 sin theta_ 13 cos delta and sin^2 theta_12 = 1/2+cot theta_23 sin theta_13 cos delta respectively. We obtain a lower bound for the phase |delta| in the normal hierarchical model, and a narrow range for |delta| for the inverted hierarchical model from cosmology. In our scenario, the mass-splitting between the quasi-degenerate right-handed neutrinos arise via renormalization group flow, which provides a lower limit on the MSSM parameter tan beta > 12. The right-handed neutrino masses can be as low as TeV, which would avoid the gravitino problem generic to supersymmetric models. | |
| dc.description | 20 pp LaTeX, 6 eps figures | |
| dc.identifier | https://arxiv.org/abs/0812.4419 | |
| dc.identifier | http://arxiv.org/abs/0812.4419 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/213358 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Common Origin for CP Violation in Cosmology and in Neutrino Oscillations | |
| dc.type | text |