Quantum gravity is a part of theoretical physics that attempts to describe gravity according t quantum mechanics. It deals with environments in which neither gravitational nor quantum effects can be ignored, such as in the distance of black holes or similar compact astrophysical objects, such as neutron stars.

Three of the four forces of physics are described within quantum mechanics and "quantum field theory". The current understanding of the fourth force, gravity, is based on Albert Einstein's general theory of relativity, which is formulated within the entirely different framework of classical physics. However, that description is incomplete: describing the gravitational field of a black hole in the general theory of relativity leads physical quantities, such as the curvature, to diverge at the center of the black hole.
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