Is Quantum Gravity Necessary?
arXiv:0803.3456 · doi:10.1088/0264-9381/25/15/154010
Abstract
In view of the enormous difficulties we seem to face in quantizing general relativity, we should perhaps consider the possibility that gravity is a fundamentally classical interaction. Theoretical arguments against such mixed classical-quantum models are strong, but not conclusive, and the question is ultimately one for experiment. I review some work in progress on the possibility of experimental tests, exploiting the nonlinearity of the classical-quantum coupling, that could help settle this question.
based on a talk given at Peyresq Physics 11, to appear in Class. Quant. Grav