> a highly upvoted but controversial answer by Lubos Motl Which is, of course, typical of Lubos Motl. :-) What his answer actually boils down to is the quantu

> a highly upvoted but controversial answer by Lubos Motl Which is, of course, typical of Lubos Motl. :-) What his answer actually boils down to is the quantum field theory answer: the claim that (a) we need a quantum theory of gravity, and (b) the known quantum field theory of a massless spin-2 field is at least a good low energy approximation to whatever the final quantum theory of gravity will turn out to be. Both of these claims are believed to be valid by many physicists, but neither one actually has any experimental evidence to support it at our current state of knowledge.