Supergravity is a classical supersymmetric unification theory. It appears in low-energy classical limits of .

-Theory unifies classical with Maxwell's classical electromagnetism () by showing that 5-dimensional general relativity is equivalent to 4-dimensional General relativity + 4-dimensional maxwell's classical electromagnetism. Supergravity goes a step ahead by also unifying the and . To do this, however, is also required. However, is a classical theory.

11-dimensional supergravity is the low-energy classical-limit of .

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