Astrophysical Tests of Lorentz Symmetry in Electrodynamics

Abstract

In this talk presented at the Fourth International Workshop on New Worlds in Astroparticle Physics, I discuss recent constraints on Lorentz violation in electrodynamics. The observed absence of birefringence of light that has propagated over cosmological distances bounds some coefficients for Lorentz violation to 2 x 10^{-32}.

Comments: 7 pages, invited talk at the Fourth International Workshop on New Worlds in Astroparticle Physics, Faro, Portugal, September, 2002