# Bounds on Vacuum-Orthogonal Lorentz and CPT Violation from Radiative Corrections

## TL;DR

This paper establishes bounds on vacuum-orthogonal Lorentz and CPT violation in the photon sector by analyzing their radiative corrections to other sectors, providing constraints on previously unconstrained operators.

## Contribution

It introduces a novel method to bound vacuum-orthogonal Lorentz violation via radiative corrections, constraining four previously unconstrained photon operators.

## Key findings

- Bounds on four photon operators at 10^{-25} to 10^{-31} GeV^{-1} levels
- Demonstrates the effectiveness of radiative corrections in constraining elusive Lorentz violations
- Provides new constraints on Lorentz and CPT violation in the photon sector

## Abstract

Certain forms of Lorentz violation in the photon sector are difficult to bound directly, since they are "vacuum orthogonal," meaning they do not change the solutions of the equations of motion in vacuum. However, these very same terms have a unique tendency to contribute large radiative corrections to effects in other sectors. Making use of this, we set bounds on four previously unconstrained $d=5$ photon operators at the $10^{-25}$-$10^{-31}$ GeV$^{-1}$ levels.