SÉMINAIRE DU GRECO
"Supergravity Higgs Inflation" |
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Ido Ben-Dayan |
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Tightly connecting inflation and particle physics will move inflation from the status of a paradigm to a specific theory. Conversely, it will provide a window for particle physics at energy scale which could be order of magnitudes above the TeV scale. I will give a brief demonstration of the problems arising from considering the inflaton as some unknown canonical slowly-rolling scalar field with a potential. The paucity of CMB observables and the lack of a strong theoretical background, seriously degrades the predictive power of such models. The situation changes considerably if we take a tightly constrained particle physics theory, which has to obey additional observations and theoretical constraints. I''ll discuss a model of inflation, where the inflaton is the neutral part of the Higgs doublet. The model is in the NMSSM supergravity framework, minimally coupled to gravity. In this model there is a shift symmetry for the Higgs doublets compatible with SU(2)_L X U(1) which enables inflation. While the model is theoretically sound it has several phenomenological problems and features. Hence it could be treated as a basis for future model building. If time permits I''ll also comment on the non-minimally coupled SM Higgs model of inflation and its validity. |
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mercredi 26 janvier 2011 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
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