Abstract
We provide a complete algebraic description of Bogomol'nyi-Prasad-Sommerfield (BPS) states in M theory in terms of primary constituents that we call BPS preons. We argue that any BPS state preserving k of the 32 supersymmetries is a composite of (32-k) BPS preons. In particular, the BPS states corresponding to the basic M2 and M5 branes are composed of 16 BPS preons. By extending the M algebra to a generalized D = 11 conformal superalgebra osp(1/64) we relate the BPS preons with its fundamental representation, the D = 11 supertwistors.
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