Gravity Couplings in the Standard-Model Extension

TL;DR

This paper reviews how the Standard-Model Extension incorporates Lorentz-violating gravity couplings, discusses toy models matching SME expansion, and summarizes experimental efforts to detect Lorentz violation in gravity.

Contribution

It provides a comprehensive review of Lorentz-violating gravity couplings within the SME and discusses toy models and experimental status.

Findings

Toy models match SME expansion including vector and tensor models

Summary of current experimental constraints on Lorentz violation in gravity

Discussion of the theoretical framework for Lorentz-violating gravity couplings

Abstract

The Standard-Model Extension (SME) is an action-based expansion describing general Lorentz violation for known matter and fields, including gravity. In this talk, I will discuss the Lorentz-violating gravity couplings in the SME. Toy models that match the SME expansion, including vector and two-tensor models, are reviewed. Finally I discuss the status of experiments and observations probing gravity coefficients for Lorentz violation.