High-scale SUSY from an R-invariant New Inflation in the Landscape

TL;DR

This paper proposes a theoretical framework linking high-scale supersymmetry breaking, R-symmetry breaking, and inflation in the string landscape, explaining the Higgs mass and cosmological observations.

Contribution

It introduces a new inflation model with R-symmetry breaking tied to reheating, providing a natural explanation for high-scale SUSY and related cosmological phenomena.

Findings

Lower bound on gravitino mass consistent with R-symmetry breaking

Predicted amplitude of density perturbations matches observations

String axions and saxions are incorporated coherently

Abstract

We provide an anthropic reason that the supersymmetry breaking scale is much higher than the electroweak scale as indicated by the null result of collider experiments and observed 125 GeV Higgs boson. We focus on a new inflation model as a typical low-scale inflation model that may be expected in the string landscape. In this model, the R-symmetry is broken at the minimum of the inflaton potential and its breaking scale is related to the reheating temperature. Once we admit that the anthropic principle requires thermal leptogenesis, we obtain a lower bound on gravitino mass, which is related to R-symmetry breaking scale. This scenario and resulting gravitino mass predict the consistent amplitude of density perturbations. We also find that string axions and saxions are consistently implemented in this scenario.