Avoid Quote by Alan Guth

The extreme weakness of quantum gravitational effects now poses some philosophical problems; maybe nature is trying to tell us something new here: maybe we…

— Richard P. Feynman

The quest for a quantum gravity is one of the greatest unsolved problems in all of science.

— Michio Kaku

Quantum mechanics as it stands would be perfect if we didn’t have the quantum-gravity issue and a few other very deep fundamental problems.

— Gerard 't Hooft

We're going to need a definitive quantum theory of gravity, which is part of a grand unified theory - it's the main missing piece.

— Kip Thorne

“The quanta of gravity, that is, are not in space; they are themselves space. The”

— Carlo Rovelli

I am not aware of any sensible theory of how classical gravity could interact with quantum matter, and I can't imagine how such a…

— Alan Guth

“Space is created by the interaction of individual quanta of gravity.”

— Carlo Rovelli

“So, in the end, the most improbable and hence the most puzzling aspect of space is its very existence. The simple fact that we…

— Lee Smolin

There was a long history of speculation that in quantum gravity, unlike Einstein's classical theory, it might be possible for the topology of spacetime…

— Edward Witten

Gravitation is, so far, not understandable in terms of other phenomena.

— Richard P. Feynman

It's actually kind of weird that we can comprehend the law of gravity, or that we can understand quantum mechanics, enough at least to…

— Edward Boyden

“Louis and I worked on two projects. In the first we tried to formulate a gravitational theory based on the dynamics of interacting loops…

— Lee Smolin