Supergravity is a theory in which supersymmetry is a local symmetry, with transformation parameters depending on spacetime position. Making supersymmetry local introduces a spin- gauge field, the gravitino, alongside the graviton describing gravity.
The reason gravity appears is structural: two supersymmetry transformations include a translation, and local translations require a dynamical spacetime geometry. The number of supercharges and the spacetime dimension determine the allowed multiplets and interactions. Eleven-dimensional supergravity and type IIA supergravity are examples with different field content and dimensional settings.
Supergravity often serves as a low-energy effective field theory of a superstring or M-theory description. That role does not make a generic finite-derivative supergravity action a complete quantum theory at arbitrarily high energy. Its validity depends on the scales at which neglected higher-derivative and additional-state effects become important.
Supergravity is a theoretical framework in physics that combines the principles of supersymmetry (SUSY) and general relativity. It is a type of gauge theory that extends the standard theories of gravity by incorporating additional symmetries that relate bosons (force-carrying particles) and fermions (matter particles).
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