Plateau Inflation in $R$-parity Violating MSSM

TL;DR

This paper develops a supergravity-based plateau inflation model within the MSSM framework, utilizing sneutrino-Higgs flat directions and a hidden sector Polonyi field, with testable predictions for collider experiments.

Contribution

It introduces a novel MSSM inflation model with a stabilized Polonyi field and specific SUSY breaking features, connecting inflationary cosmology with collider phenomenology.

Findings

Inflation occurs along a sneutrino-Higgs flat direction.

Polonyi field stabilization solves the cosmological moduli problem.

Predicted TeV-scale diphoton resonance could be observed at the LHC.

Abstract

Inflation with plateau potentials give the best fit to the CMB observables as they predict tensor to scalar ratio stringently bounded by the observations from Planck and BICEP2/Keck. In supergravity models it is possible to obtain plateau potentials for scalar fields in the Einstein frame which can serve as the inflation potential by considering higher dimensional Planck suppressed operators and by the choice of non-canonical K\"ahler potentials. We construct a plateau inflation model in MSSM where the inflation occurs along a sneutrino-Higgs flat direction. A hidden sector Polonyi field is used for the breaking of supersymmetry after the end of the inflation. The proper choice of superpotential leads to strong stabilization of the Polonyi field, $m_{Z}^2\gg m_{3/2}^2$, which is required to solve the cosmological moduli problem. Also, the SUSY breaking results in a TeV scale gravitino mass and scalar masses and gives rise to bilinear and triliear couplings of scalars which can be tested at the LHC. The sneutrino inflation field can be observed at the LHC as a TeV scale diphoton resonance like the one reported by CMS and ATLAS.