Lorentz Violation and Torsion

In this proceedings, similarities between the structure of theories with Lorentz violation and theories with constant torsion in flat spacetime are exploited to place bounds on torsion components. An example is given showing the analysis leading to bounds on the axial-vector and mixed-symmetry components of torsion, based on a dual-maser experiment.Comment: 5 pp, talk given at 4th Meeting on Lorentz and CPT Violation, Bloomington, Indiana, USA, 8-11 August 200

Remarks on Finsler Geometry and Lorentz Violation

The physics of classical particles in a Lorentz-breaking spacetime has numerous features resembling the properties of Finsler geometry. In particular, the Lagrange function plays a role similar to that of a Finsler structure function. A summary is presented of recent results, including new calculable Finsler structures based on Lagrange functions appearing in the Lorentz-violation framework known as the Standard-Model Extension.Comment: Presented at the Sixth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 17-21, 201

Tests of Lorentz Symmetry with Penning Traps and Antihydrogen

Possibilities for testing Lorentz symmetry using precision experiments with antiprotons in Penning traps and with antihydrogen spectroscopy are reviewed. Estimates of bounds on relevant coefficients for Lorentz violation in the Standard-Model Extension (SME) are considered.Comment: 8pp, proceedings of invited talk at 8th International Conf. on Low Energy Antiproton Physics (LEAP '05), Bonn, Germany, May 200

Testing Relativity with Orbiting Oscillators

Clock-comparison experiments using a satellite platform can give Planck-scale sensitivity to many parameters for Lorentz and CPT violation that are difficult to measure on Earth. A discussion of the theoretical framework for such tests is given, with emphasis on comparisons of output frequencies of atomic clocks and of electromagnetic cavity oscillators.Comment: 11 pages, invited talk at HYPER symposium "Fundamental Physics and Applications of Cold Atoms in Space," Centre National d'Etudes Spatiales, Paris, France, 4-6 November 200