title: Cosmological constraints on Lorentz violation in electrodynamics.
abstract: Infrared, optical, and ultraviolet spectropolarimetry of cosmological sources is used to constrain the pure electromagnetic sector of a general Lorentz-violating standard-model extension. The coefficients for Lorentz violation are bounded to less than 3 x 10(-32).
authors.affiliation: Physics Department, Indiana University, Bloomington, Indiana 47405, USA.
authors.forename: V A
authors.initials: VA
authors.lastname: Kostelecký
authors.forename: M
authors.initials: M
authors.lastname: Mewes