Group field theory

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Not to be confused with group theory. This article is about group field theory as a candidate theory of quantum gravity.

Group field theory (GFT) is a quantum field theory in which the base manifold is taken as a Lie group. It is closely related to background independent quantum gravity approaches such as loop quantum gravity and spin foam and causal dynamical triangulation. In fact, it can be shown that its perturbative expansion can be interpreted as spin foams and simplicial pseudo-manifolds (depending on the representation of the fields). Thus, its partition function defines a non-perturbative sum over all simplicial topologies and geometries, giving a path integral formulation of quantum spacetime.

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