Modeling-Free Bounds on Nonrenormalizable Isotropic Lorentz and CPT Violation in QED

TL;DR

This paper derives bounds on isotropic Lorentz and CPT violation in QED without relying on astrophysical source modeling, using laboratory and astrophysical data to set limits on modified dispersion relations.

Contribution

It provides modeling-free bounds on Lorentz and CPT violation in QED from laboratory and astrophysical observations, avoiding dependence on distant source modeling.

Findings

Bounds range from 4 x 10^(-13) to 6 x 10^(-33) (GeV)^(-1).

Strongest bounds come from cosmological birefringence and photon decay data.

Limits apply to modifications of electron, positron, and photon dispersion relations.

Abstract

The strongest bounds on some forms of Lorentz and CPT violation come from astrophysical data, and placing such bounds may require understanding and modeling distant sources of radiation. However, it is also desirable to have bounds that do not rely on these kinds of detailed models. Bounds that do not rely on any modeling of astrophysical objects may be derived both from laboratory experiments and certain kinds of astrophysical observations. The strongest such bounds on isotropic modifications of electron, positron, and photon dispersion relations of the form E^2 = p^2 + m^ 2 + epsilon p^3 come from data on cosmological birefringence, the absence of photon decay, and radiation from lepton beams. The bounds range in strength from the 4 x 10^(-13) to 6 x 10^(-33) (GeV)^(-1) levels.