Variations in the CMB is a lovely sub grift in the cosmology ecosystem. I only know from former peers back from grad school who went into that area, so take my

Variations in the CMB is a lovely sub grift in the cosmology ecosystem. I only know from former peers back from grad school who went into that area, so take my take with a grain of salt of course. This is (yet another) "explanation" of variations but of course it isn't convincing, many other things could explain different variations in the CMB hence why it's a furtile area for particle physicists to grind for publications.