SUGRA Hybrid Inflation with Shift Symmetry

Details SUGRA Hybrid Inflation with Shift Symmetry SUGRA Hybrid Inflation with Shift Symmetry

2009-02-17

arxiv.org/abs/0902.2934v2

Phys.Lett.B677:221-225,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 3 figures; appendix and references added; version published in PLB

Scientific paper

10.1016/j.physletb.2009.05.043

We propose a solution to the eta-problem in supergravity (SUGRA) hybrid inflation using a Nambu-Goldstone-like shift symmetry within a new class of models. The flatness of the tree-level inflaton potential is ensured by shift symmetry invariance of the Kaehler potential, while a small symmetry breaking term in the superpotential gives rise to a slope of the potential at loop-level. In the proposed class of inflation models, potentially dangerous couplings between the inflaton and the moduli sector are avoided. We also discuss under which conditions the predicted spectral index can be in agreement with the best-fit-value of the latest WMAP observation n_s ~ 0.96, corresponding to a hilltop-type inflaton potential at loop-level.

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