Gravitino Condensates in the Early Universe and Inflation

TL;DR

This paper reviews how gravitino condensates can drive early universe inflation and break supersymmetry through a super-Higgs effect, linking quantum gravity effects with cosmological inflation consistent with observational data.

Contribution

It introduces a novel scenario where gravitino condensates induce inflation and supersymmetry breaking without external matter coupling, connecting supergravity dynamics with cosmological observations.

Findings

Gravitino condensates can cause inflation via higher-order curvature corrections.

The model aligns with Planck data within GUT-scale parameters.

Dynamically-induced gravitino mass supports super-Higgs mechanism in cosmology.

Abstract

We review work on the formation of gravitino condensates via the super-Higgs effect in the early Universe. This is a scenario for both inflating the early universe and breaking local supersymmetry (supergravity), entirely independent of any coupling to external matter. The goldstino mode associated with the breaking of (global) supersymmetry is "eaten" by the gravitino field, which becomes massive (via its own vacuum condensation) and breaks the local supersymmetry (supergravity) dynamically. The most natural association of gravitino condensates with inflation proceeds in an indirect way, via a Starobinsky-inflation-type phase. The higher-order curvature corrections of the (quantum) effective action of gravitino condensates induced by integrating out massive gravitino degrees of freedom in a curved space-time background, in the broken-supergravity phase, are responsible for inducing a scalar mode which inflates the Universe. The scenario is in agreement with Planck data phenomenology in a natural and phenomenologically-relevant range of parameters, namely Grand-Unified-Theory values for the supersymmetry breaking energy scale and dynamically-induced gravitino mass.