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What (who) is N = 8 supergravity - definition
N = 8 supergravity
FOUR-DIMENSIONAL THEORY OF GRAVITY WITH MAXIMAL SUPERSYMMETRY (32 SUPERCHARGES)
N=8 Supergravity
In four spacetime dimensions, N = 8 supergravity is the most symmetric quantum field theory which involves gravity and a finite number of fields. It can be found from a dimensional reduction of 11D supergravity by making the size of seven of the dimensions go to zero.
Higher-dimensional supergravity
UNIQUE INTERACTING SUPERSYMMETRIC THEORY (WITHOUT HIGHER SPINS) IN 11 DIMENSIONS; LOW-ENERGY EFFECTIVE THEORY OF M-THEORY
Higher dimensional supergravity; Yang–Mills–Einstein supergravity; Yang-Mills-Einstein supergravity; Maximal supergravity
Higher-dimensional supergravity is the supersymmetric generalization of general relativity in higher dimensions. Supergravity can be formulated in any number of dimensions up to eleven.
Examples of use of N = 8 supergravity
1. It is a euphemism and also a smart bit of marketing, anchoring the unsexy, techie bones of his subject – he once said the best hope for a theory of everything was n=8 supergravity – with the philosophical questions everyone likes to have a stab at.