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The Copernican principle, a cornerstone of modern cosmology, remains largelyunproven at Gpc radial scale and above. Here we will show that, violations ofthis type will inevitably cause a first order anisotropic kinetic SunyaevZel'dovich (kSZ) effect. If large scale radial inhomogeneities have amplitudelarge enough to explain the "dark energy" phenomena, the induced kSZ powerspectrum will be much larger than the ACT/SPT upper limit. This single testconfirms the Copernican principle and rules out the adiabatic void model as aviable alternative to dark energy.

Confirmation of the Copernican principle at Gpc radial scale and above from the kinetic Sunyaev Zel'dovich effect power spectrum