Testing supersymmetric Higgs inflation with non-Gaussianity

Abstract

We investigate multi-field signatures of the nonminimally coupled supersymmetric Higgs inflation-type cosmological scenario, focusing on the two-field Higgs-lepton inflation model as a concrete example. This type of inflationary model is realized in a theory beyond the Standard Model embedded in supergravity with a noncanonical Kähler potential. We employ the backward $\delta N$ formalism to compute cosmological observables, including the scalar and tensor power spectra, the spectral indices, the tensor-to-scalar ratio and the local-type nonlinearity parameter. The trajectory of the inflaton is controlled by the initial conditions of the inflaton as well as by the coefficients in the Kähler potential. We analyze the bispectrum of the primordial fluctuations when the inflaton trajectory deviates from a straight line, and obtain constraints on the noncanonical terms of the Kähler potential using the Planck satellite data. Our analysis represents a concrete particle phenomenology-based case study of inflation in which primordial non-Gaussianities can reveal aspects of supergravity.

16 pages, 8 figures, revtex4. v2: typos corrected, comments and references added, version to be published, v3: typos corrected

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• Higgs-portal assisted Higgs inflation with a sizeable tensor-to-scalar ratio
• Multifield dynamics of supersymmetric Higgs inflation in SU(5) GUT
• Supergravity, $\alpha$-attractors and primordial non-Gaussianity
• Non-Gaussianity in rapid-turn multi-field inflation
• Non-minimally assisted chaotic inflation
• Distinguishing cosmological models through quantum signatures of primordial perturbations
• Gravitino constraints on supergravity inflation
• Nonminimally Assisted Inflation: A General Analysis
• Messenger inflation in gauge mediation and superWIMP dark matter
• Running Non-Minimal Inflation with Stabilized Inflaton Potential
• Chaotic initial conditions for nonminimally coupled inflation via a conformal factor with a zero
• Inflation and type III seesaw mechanism in $\nu$-gauge mediated supersymmetry breaking
• Development of generic no-scale inflation