Theoretical Physics aims to describe gravity according to the principles of quantum mechanics and this branch of theoretical physics came to be known as Quantum gravity. All our current understanding of gravity is based on Albert Einstein's general theory of relativity, which had derived its framework from classical physics and it is argued that a quantum mechanical description of gravity is necessary near compact astrophysical objects where the effects of gravity are strong and quantum effects cannot be ignored. Strictly speaking, the aim of quantum gravity is only to describe the quantum behavior of the gravitational field and while it is at times referred to as a theory of everything it is not completely true. Quantum gravitational effects are extremely weak and therefore difficult to test and it focuses on the question of coupling of spin and spacetime and the precise nature of this coupling is currently unknown.

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