Higgs-Squark-Slepton Inflation from the MSSM

TL;DR

This paper proposes a novel inflation model within the MSSM where the inflaton is a combination of Higgs, squark, and slepton fields, predicting specific cosmological parameters and reheating details.

Contribution

It introduces a new MSSM-based inflation scenario with explicit predictions for cosmological parameters and reheating processes, linking particle physics with early universe cosmology.

Findings

Predicts $ an eta \,\simeq 13.1$ from curvature perturbation amplitude.

Forecasts scalar spectral index $n_s \simeq 0.966$ and tensor-to-scalar ratio $r=0.00118$.

Reheating temperature estimated at $T_r \simeq 1.4 \times 10^7$ GeV.

Abstract

The inflation within the MSSM is proposed, where the inflaton field is a combination of the Higgs, squark and slepton states. While the inflationary phase is fully governed by the electron Yukawa superpotential coupling, the fields' condensates float along the flat $D$-term trajectory. This predicts the MSSM parameter $\tan \beta \simeq 13.1$ determined via the value of the curvature perturbation amplitude. The values of the scalar spectral index and the tensor-to-scalar ratio are predicted to be $n_s\simeq 0.966$ and $r=0.00118$. The postinflation reheating of the Universe proceeds by the radiative decay of the inflaton to the two gluons ($\phi \to gg$) with the reheating temperature $T_r\simeq 1.4\cdot 10^7$ GeV.