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• W2079600985 abstract "We present a model of inflation in a supergravity framework in the Einstein frame where the Higgs field of the next to minimal supersymmetric standard model (NMSSM) plays the role of the inflaton. Previous attempts which assumed non-minimal coupling to gravity failed due to a tachyonic instability of the singlet field during inflation. A canonical K{a}hler potential with textit{minimal coupling} to gravity can resolve the tachyonic instability but runs into the $eta$-problem. We suggest a model which is free of the $eta$-problem due to an additional coupling in the K{a}hler potential which is allowed by the Standard Model gauge group. This induces directions in the potential which we call K-flat. For a certain value of the new coupling in the (N)MSSM, the K{a}hler potential is special, because it can be associated with a certain shift symmetry for the Higgs doublets, a generalization of the shift symmetry for singlets in earlier models. We find that K-flat direction has $H_u^0=-H_d^{0*}.$ This shift symmetry is broken by interactions coming from the superpotential and gauge fields. This direction fails to produce successful inflation in the MSSM but produces a viable model in the NMSSM. The model is specifically interesting in the Peccei-Quinn (PQ) limit of the NMSSM. In this limit the model can be confirmed or ruled-out not just by cosmic microwave background observations but also by axion searches." @default.
• W2079600985 created "2016-06-24" @default.
• W2079600985 creator A5057089571 @default.
• W2079600985 creator A5087056006 @default.
• W2079600985 date "2010-12-03" @default.
• W2079600985 modified "2023-10-16" @default.
• W2079600985 title "Supergravity Higgs inflation and shift symmetry in electroweak theory" @default.
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• W2079600985 doi "https://doi.org/10.1088/1475-7516/2010/12/002" @default.
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