Loop quantum gravity
Loop quantum gravity Loop quantum gravity ( LQG ) is a theory of quantum gravity , merging quantum mechanics and general relativity , making it a possible candidate for a theory of everything . Its goal is to unify gravity in a common theoretical framework with the other three fundamental forces of nature, beginning with relativity and adding quantum features. It competes with string theory that begins with quantum field theory and adds gravity. From the point of view of Einstein 's theory, all attempts to treat gravity as another quantum force equal in importance to electromagnetism and the nuclear forces have failed. According to Einstein, gravity is not a force – it is a property of spacetime itself . Loop quantum gravity is an attempt to develop a quantum theory of gravity based directly on Einstein's geometric formulation. To do this, in LQG theory space and time are quantized , analogously to the w...