Supersymmetric supermembrane vacua and singletons
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The eleven-dimensional supermembrane exhibits a local world-volume Siegel symmetry provided the spacetime background is a solution of D=11 supergravity. If this background admits Killing spinors, the supermembrane action also admits rigid spacetime supersymmetries. We show that in a physical gauge, these symmetries give rise to rigid world-volume supersymmetries and we derive criteria for the existence of surviving supersymmetries of membrane vacua. We then obtain new supermembrane solutions in which spacetime is the product of four-dimensional anti-de Sitter space and a compact seven-dimensional internal space M7, and the membrane occupies the boundary of AdS at spatial infinity. Applying our criteria for vacuum supersymmetry, we find that for an M7 with N Killing spinors, the vacuum has N surviving supersymmetries. The physical fluctuations can be interpreted as singletons of OSp(4/N). 1987.