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Re: absolute velocity, cosmology, special relativity

Does the detection of our absolute motion through the heavens relative to
the cosmic background radiation (by noting different temperatures in
different directions) violate the postulates of special relativity? Is the
cosmic background radiation "the" absolute fixed reference frame?

The answer is "No". One may define the CMBR isotropy frame as an
absolute frame of rest, but it has no special property apart from
that; there is no physical consequence of having a velocity with
respect to that frame which leads to anisotropy in any physical
system having such a velocity. The CMBR anisotropy itself is the
only observable "consequence".