title: Tests of relativity using a cryogenic optical resonator.
abstract: A 190-day comparison of the optical frequencies defined by an optical cavity and a molecular electronic transition is analyzed for the velocity independence of the speed of light (Kennedy-Thorndike test) and the universality of the gravitational redshift. The modulation of the laboratory velocity and the gravitational potential were provided by Earth's orbital motion around the Sun. We find a velocity-dependence coefficient of (1.9+/-2.1)x10(-5), 3 times lower compared to the best previous test. Alternatively, the data confirm the gravitational redshift for an electronic transition at the 4% level. Prospects for significant improvements of the tests are discussed.
authors.affiliation: Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Braxmaier
authors.forename: H
authors.initials: H
authors.lastname: Müller
authors.forename: O
authors.initials: O
authors.lastname: Pradl
authors.forename: J
authors.initials: J
authors.lastname: Mlynek
authors.forename: A
authors.initials: A
authors.lastname: Peters
authors.forename: S
authors.initials: S
authors.lastname: Schiller