A Next-to-minimal supersymmetric model of hybrid inflation

Bastero-Gil, M.; King, S.F.

doi:10.1016/S0370-2693(98)00124-5

A Next-to-minimal supersymmetric model of hybrid inflation

M. Bastero-Gil
(
- Southampton U.
)
,
S.F. King
(
- CERN
)

Sep, 1997

16 pages

Published in:

Phys.Lett.B 423 (1998) 27-34

e-Print:

hep-ph/9709502 [hep-ph]

DOI:

10.1016/S0370-2693(98)00124-5

Report number:

CERN-TH-97-262

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Abstract:

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}

.

Note:

17 pages, Latex; note added, accepted for Phys. Lett. B Report-no: CERN-TH/97-262

inflation: hybrid
supersymmetry: minimal
strong interaction: CP
axion
symmetry: Z(3) x Z(5)
string model
domain wall
coupling
scalar particle: singlet
mu-problem

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