# Compton Edge probing basic physics at Jefferson Laboratory: light speed isotropy and Lorentz invariance

## TL;DR

This paper proposes an experiment at Jefferson Laboratory to test the isotropy of light speed and Lorentz invariance with higher precision than previous experiments, using Compton Edge measurements.

## Contribution

It introduces a new experimental setup at Jefferson Laboratory to improve tests of light speed isotropy and Lorentz invariance beyond previous limits.

## Key findings

- Enhanced accuracy in light speed isotropy testing by an order of magnitude.
- Significantly improved limits on the dependence of light speed on apparatus velocity.
- Successful adaptation of a proven experimental method to Jefferson Laboratory.

## Abstract

We propose to study of the light speed isotropy and Lorentz invariance at Jefferson Laboratory by means of the measurements of the Compton Edge using of the Hall A/C existing experimental setup. Methodologically the same experiment has already been successfully elaborated at GRAAL experiment at the European Synchrotron Radiation Facility in Grenoble with 6 GeV electron beam. This Proposal states two goals expected to be reached at Jefferson Laboratory, both on Lorentz invariance: (a) the one-way light speed isotropy testing accuracy, following from conservative evaluations at numerical simulations, to about an order of magnitude better than was GRAAL's; (b) the dependence of the light speed on the velocity of the apparatus (Kennedy-Thorndike measurement) will be traced to an accuracy about 3 orders of magnitudes better than the available limits.

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Source: https://tomesphere.com/paper/1706.08907