Singletons, higher spin massless states and the supermembrane
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We analyse the spectrum of the eleven-dimensional supermembrane quantized in AdS4 S7 background. The classical membranes lives at the boundary of AdS4 which is S2 S1, and has OSp(8,4) symmetry. We find that the spectrum contains, in addition to the N=8 supersymmetric (massive) singletons (which may possibly be the ultimate preons), also massless states of all higher integer and half-integer spin. These states fill the irreducible representations of OSp(8,4) with highest spin smax=2,4,6,... The Smax = 2 multiplet corresponds to the states of the de Wit-Nicolai's N = 8 gauged supergravity in four dimensions. 1988.
