Gravity from Lorentz Symmetry Violation

TL;DR

This paper explores an alternative explanation for the masslessness of gravitons, suggesting it could result from spontaneous Lorentz symmetry violation rather than diffeomorphism invariance in general relativity.

Contribution

It introduces the concept that graviton masslessness may originate from spontaneous Lorentz symmetry breaking, offering a new perspective beyond traditional general relativity.

Findings

Proposes a mechanism linking Lorentz symmetry violation to graviton properties.

Suggests a new theoretical framework for understanding gravity.

Challenges the conventional view of graviton masslessness.

Abstract

In general relativity, the masslessness of gravitons can be traced to symmetry under diffeomorphisms. Here we consider another possibility, whereby the masslessness arises from spontaneous violation of Lorentz symmetry.