High-Scale SUSY from Sgoldstino Inflation

TL;DR

This paper reviews supergravity models supporting natural de Sitter vacua and proposes an inflationary scenario compatible with high-scale SUSY and LHC Higgs results, with specific predictions for spectral index and tensor-to-scalar ratio.

Contribution

It introduces a variant of no-scale supergravity models that realize inflection-point inflation with subplanckian fields, consistent with observational data and high-scale SUSY.

Findings

Inflection-point inflation achieved at subplanckian field values.

Spectral index ns requires tuning of about 10^-6.

Tensor-to-scalar ratio is very small.

Abstract

We review a number of unimodular no-scale supergravity models with F-term SUSY breaking which support technically natural de Sitter vacua. A variant of these models develops a stage of inflection-point inflation which can be realized for subplanckian field values consistently with the observational data. For central value of the spectral index ns, the necessary tuning is of the order of 10^-6, the tensor-to-scalar ratio is tiny whereas the running of ns is around -3x10^-3. Our proposal is compatible with high-scale SUSY and the results of LHC on the Higgs boson mass.