The cosmic microwave background radiation seems initially to be uniform at around 2.7 Kelvin. Then when you look at the variation at a factor of one thousand in detail you see an anisotropic variation. Then when you filter out the anisotropic variation and increase the magnification by another factor of one thousand you see the familiar CMB map.

The anisotropic variation is attributed to a velocity of the Milky Way galaxy of 552km/sec in a specific direction: This CMB anisotropic variation then can be used to identify a CMB rest frame.

Given the expansion of space, it follows that if you move a distance of approximately 26 million light years in the opposite direction, you will find yourself at a unique place in the universe where the CMB radiation is isotopic. The fact that there is a unique CMB rest point seems to violate the cosmological principle where there are supposed to be no such special locations.

As the cosmological principle is such an important foundational assumption of current cosmology, this seems to be an important issue.

I wonder if anyone can explain this observation of the CMB without abandoning the cosmological principle?

Richard

More Richard Lewis's questions See All
Similar questions and discussions