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Higher-dimensional 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. This article focuses upon supergravity (SUGRA) in greater than four dimensions.
== Supermultiplets ==
Fields related by supersymmetry transformations form a supermultiplet; the one that contains a graviton is called the supergravity multiplet.
The name of a supergravity theory generally includes the number of dimensions of spacetime that it inhabits, and also the number of gravitinos that it has. Sometimes one also includes the choices of supermultiplets in the name of theory. For example, an , (9 + 1)-dimensional supergravity enjoys 9 spatial dimensions, one time and 2 gravitinos. While the field content of different supergravity theories varies considerably, all supergravity theories contain at least one gravitino and they all contain a single graviton. Thus every supergravity theory contains a single supergravity supermultiplet. It is still not known whether one can construct theories with multiple gravitons that are not equivalent to multiple decoupled theories with a single graviton in each. In maximal supergravity theories (see below), all fields are related by supersymmetry transformations so that there is only one supermultiplet: the supergravity multiplet.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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