Does the Cosmic Background Radiation Provide an Absolute Frame of Reference?

[shelanachium]

According to Einstein, there is no absolute frame of reference; no such thing as 'absolute rest'. But does not the Cosmic Background Radiation provide an absolute frame of reference? An object for which this radiation is totally isotropic is at absolute rest; I gather we move relative to it at some 800km/sec., and in a known direction.

 

[Garth]

The CMB provides a cosmological frame of reference; for it to be 'absolute' in some sense would require the laws of physics in that frame to be special in some sense.

Garth