Gravity Emerges...From Neutrinos?

A very interesting paper appeared on the arXiv last week, from Bob McElrath. Bob is a former theory postdoc at UC Davis and now at CERN. He's spent a good deal of the last several years on this idea, and now it's out there in print, though not yet peer-reviewed. This is more Sean's and Mark's territory, but to me it seems that if he's right a number of sacred cows may be headed for oblivion. One of the great mysteries of modern physics is why gravity is so much weaker than the other forces (strong, electromagnetic, and weak). Many great minds have worked to incorporate gravity into the same sort of relativistic quantum field theory that we use to describe the other three, and have failed more or less utterly for decades. Is there something fundamentally different about gravity? Einstein's general relativity, which links gravity to the warping of ...