Sub-eV Hubble scale inflation within gauge mediated supersymmetry breaking

TL;DR

This paper demonstrates that the minimal supersymmetric standard model with gauge mediation can support sub-eV Hubble scale inflation, producing correct density perturbations, spectral tilt, and dark matter abundance, with implications for baryogenesis.

Contribution

It shows that gauge mediated supersymmetry breaking within the MSSM can realize low-scale inflation with realistic cosmological outcomes.

Findings

Achieves sub-eV Hubble scale inflation consistent with observations

Predicts a reheat temperature below 10 TeV favoring electroweak baryogenesis

Provides a viable dark matter candidate in gravitinos with mass above 100 keV

Abstract

Minimal Supersymmetric Standard Model with gauge mediated supersymmetry breaking has all the necessary ingredients for a successful sub-eV Hubble scale inflation $H_{\rm inf} \sim 10^{-3}-10^{-1}$ eV. The model generates the right amplitude for scalar density perturbations and a spectral tilt within the range, $0.90 \leq n_s \leq 1$. The reheat temperature is $T_{\rm R} \ls 10$ TeV, which strongly prefers electroweak baryogenesis and creates the right abundance of gravitinos with a mass $m_{3/2} \gs 100$ keV to be the dark matter.