Supersymmetric Sneutrino-Higgs Inflation

TL;DR

This paper demonstrates that a specific combination of Higgs and sneutrino fields in a supersymmetric B-L MSSM model can serve as the inflaton, achieving successful inflation consistent with Planck2015 data without non-standard gravity couplings.

Contribution

It introduces a novel inflaton candidate within the supersymmetric B-L MSSM framework, compatible with phenomenological constraints and standard gravity coupling.

Findings

Achieves 60 e-foldings of inflation with Planck2015 compatible parameters.

Identifies initial conditions that satisfy both cosmological and LHC phenomenological constraints.

Inflation occurs with sub-Planckian fields and no non-standard gravity couplings.

Abstract

It is shown that in the phenomenologically realistic supersymmetric $B-L$ MSSM theory, a linear combination of the neutral, up Higgs field with the third family left-and right-handed sneutrinos can play the role of the cosmological inflaton. Assuming that supersymmetry is softly broken at a mass scale of order $10^{13}~\mathrm{GeV}$, the potential energy associated with this field allows for 60 e-foldings of inflation with the cosmological parameters being consistent with all Planck2015 data. The theory does not require any non-standard coupling to gravity and the physical fields are all sub-Planckian during the inflationary epoch. It will be shown that there is a "robust" set of initial conditions which, in addition to satisfying the Planck data, simultaneously are consistent with all present LHC phenomenological requirements.