19 September 2006
Lorentz invariance in good health
A new test of Lorentz invariance was announced in gr-qc/0609072. Two cylindrical sapphire microwave resonators, which are perpendicular to each other, are set in rotation. Standing waves are set up in the resonators and if the velocity of light is not isotropic there will be a change in the frequency difference as the resonators rotate. This experiment was performed before but now more than one year of data was accumulated improving earlier results by a factor of 10. Lorentz invariance is still up.