Cosmic Microwave Background anisotropies are an artefact the accelerating frame of reference observing them.
The most recent and accurate maps of the Cosmic Microwave Background (CMB) have been made from spacecraft that orbit at the Earth-Sun L2 region (WMAP and Planck). This should be a moot point because they are observing the most distant phenomenon possible, in both space and time, which should be independent of our reference frame. However, it appears that the CMB is anisotropic in precisely the plane of the solar system ecliptic. This axis is dubbed the cosmological "Axis of Evil" That is also the plane around the sun that the observing spacecraft orbit (as well as the Earth around the Sun). The centripetal acceleration due to the orbit of the craft is in a vector direction on average in the opposite direction to observations as they are made over the course of an orbit of the sun which is a calendar year. The accelerating frame of reference is thus precisely in the same plane as the anisotropy of the CMB for both of the two independent craft studying the CMB.
The only way that the acceleration and CMB can be connected in this way is if the CMB constitutes a Hubble horizon - that is, a cosmic scale fundamental limit to information. Thus, the anisotropies that we see in the CMB, far from being information about the early universe, is a reflection of observer's own acceleration frame of reference, and is therefore information-less Unruh radiation differentials. That is, what we see in the background radiation instantaneously reflects our frame of reference at the information boundary in that precise direction in which we see that radiation.
This would seem to imply a non-local communication between a local object and the Hubble horizon which violates known limits. However, the answer to this is that the phase speed of a monochromatic Unruh wave is not limited by the speed of light since it carries no information. So a local Unruh wave may well be aware of distant horizons without paradox.
An easy way to test this dependence is to repeat observations from the same craft, but always in arcs that are 90 degrees to the centripetal acceleration. The whole sky can still be scanned within a year of observations, the sun (earth) angle will always be 90 degrees to observed CMB rather than a friendlier 135 degrees plus in previous observations.
