Massive Graviton on a Spatial Condensate

TL;DR

This paper explores a model where gravity's gauge symmetry breaks spontaneously, giving the graviton mass, and applies it to inflation to address IR divergence issues in loop diagrams.

Contribution

It introduces a simple massive gravity model based on spatial condensates and demonstrates its application to inflationary cosmology.

Findings

Graviton acquires mass through spatial gauge symmetry breaking.

The model removes IR divergence in inflationary loop calculations.

Provides a new framework for massive gravity in cosmology.

Abstract

In this paper, we consider the spatial gauge symmetries spontaneously break down in GR, and graviton becomes massive on this spatial condensate background. Such model can be considered as a simplest example of massive gravity. We then apply our massive gravity theory to inflation, the graviton mass removes the IR divergence of the inflationary loop diagram.