A Next-to-Minimal Supersymmetric Model of Hybrid Inflation

Details A Next-to-Minimal Supersymmetric Model of Hybrid Inflation A Next-to-Minimal Supersymmetric Model of Hybrid Inflation

1997-09-30

arxiv.org/abs/hep-ph/9709502v2

Phys.Lett. B423 (1998) 27-34

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, Latex; note added, accepted for Phys. Lett. B

Scientific paper

10.1016/S0370-2693(98)00124-5

We propose a model of inflation based on a simple variant of the NMSSM, called $\phi$NMSSM, where the additional singlet $\phi$ plays the role of the inflaton in hybrid (or inverted hybrid) type models. As in the original NMSSM, the $\phi$NMSSM solves the $\mu$ problem of the MSSM via the VEV of a gauge singlet $N$, but unlike the NMSSM does not suffer from domain wall problems since the offending $Z_3$ symmetry is replaced by an approximate Peccei-Quinn symmetry which also solves the strong CP problem, and leads to an invisible axion with interesting cosmological consequences. The PQ symmetry may arise from a superstring model with an exact discrete $Z_3 \times Z_5$ symmetry after compactification. The model predicts a spectral index $n=1$ to one part in $10^{12}$.

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