We report results on an “ one-way light path ” laser diffraction experiment as a function of the laser beam alignment relative to the Earth ’ s velocity vector obtained by COBE measurements of the Doppler shift in the cosmic microwave background radiation ( CMBR ) .
An amplified Doppler shift is observed in the diffraction images , and the effect is compatible with a “ dipole ” speed of light anisotropy due to Earth ’ s motion relative to the “ CMBR rest frame ” , with an amplitude of \delta c / \bar { c } = 0.00123 .
This amplitude coincides with the value of the dipole temperature anisotropy \delta T / \bar { T } = 0.00123 of the CMBR obtained by COBE .
Our results point out that it is not possible to neglect the preferred frame imposed by the cosmology and they are well described by the Ether Gauge Theory ( an extension of the Lorentz ’ s ether theory ) and it satisfies the cosmological time boundary condition .