Quantum Gravity as a Metaphysical Problem

Quantum gravity is usually represented as being one of the central open problems of modern fundamental physics. It is presented as being “a dream, a theoretical need and a scientific goal. It is a theory which still does not exist in complete form”, a “yet-to-be-found theory” [1]. The starting point of this paper is that such a non-existence claim is wrong: There exists a simple and straightforward way to construct a quantum theory of gravity-that means, a well-defined quantum theory, which in some well-defined limit gives the classical Einstein equations of GR. Moreover, the technical way how to do this is well-known and well-understood in all of its parts.