An optical ring cavity is used to place the first laboratory constraints on parity-odd nonrenormalizable Lorentz violation. Variations in resonant frequencies are limited to parts in 1015. Absolute sensitivity to Lorentz-violating operators of mass dimension 6 is improved by a factor of a million over existing parity-even microwave-cavity bounds. Sensitivity to dimension-8 violations is improved by fourteen orders of magnitude.
@article{arxiv.1310.1952,
title = {Optical-Cavity Limits on Higher-Order Lorentz Violation},
author = {Yuta Michimura and Matthew Mewes and Nobuyuki Matsumoto and Yoichi Aso and Masaki Ando},
journal= {arXiv preprint arXiv:1310.1952},
year = {2013}
}