The quantum state of spacetime is described in the theory by means of a mathematical structure called spin networks. Spin networks were initially introduced by Roger Penrose in abstract form, and later shown by Carlo Rovelli and Lee Smolin to derive naturally from a non-perturbative quantization of general relativity. Spin networks do not represent quantum states of a field in spacetime: they represent directly quantum states of spacetime.
the quantum state of spacetime is described in the theory by means of a mathematical structure called spin networks spin networks were initially introduced by roger penrose in abstract form and later shown by carlo rovelli and lee smolin to derive naturally from a non-perturbative quantization of general relativity spin networks do not represent quantum states of a field in spacetime they represent directly quantum states of spacetime