Probing the Light Speed Anisotropy with respect to the Cosmic Microwave Background Radiation Dipole

Details Probing the Light Speed Anisotropy with respect to the Cosmic Microwave Background Radiation Dipole Probing the Light Speed Anisotropy with respect to the Cosmic Microwave Background Radiation Dipole

2004-10-29

arxiv.org/abs/astro-ph/0410742v2

Mod.Phys.Lett. A20 (2005) 19-28

Astronomy and Astrophysics

Astrophysics

The published version: reported at the workshop "Testing the Equivalence Principle in Space and on Ground" (STEP), Pescara, It

Scientific paper

10.1142/S0217732305016294

We have studied the angular fluctuations in the speed of light with respect to the apex of the dipole of Cosmic Microwave Background (CMB) radiation using the experimental data obtained with GRAAL facility, located at the European Synchrotron Radiation Facility (ESRF) in Grenoble. The measurements were based on the stability of the Compton edge of laser photons scattered on the 6 GeV monochromatic electron beam. The results enable to obtain a conservative constraint on the anisotropy in the light speed variations \Delta c(\theta)/c < 3 10^{-12}, i.e. with higher precision than from previous experiments.

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