http://www.nature.com/news/how-astro...g-bang-1.14885
John KOvac..."Everyone in cosmology knows — but it is not widely appreciated — that the prediction about B modes from inflation relies not just on the phenomenon of gravitational waves but on the quantization of
gravity itself. Inflation assumes that everything started out as quantum fluctuations that then got amplified by inflation. So at a very deep level, this finding relies on the connection between quantum mechanics and gravity being right."...
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