N=31, D=11

  title={N=31, D=11},
  author={Ulf Gran and J. B. Gutowski and George Papadopoulos and D. van der Roest},
  • Ulf Gran, J. B. Gutowski, +1 author D. van der Roest
  • Published 2007
  • Physics
  • We show that eleven-dimensional supergravity backgrounds with thirty one supersymmetries, N = 31, admit an additional Killing spinor and so they are locally isometric to maximally supersymmetric ones. This rules out the existence of simply connected eleven-dimensional supergravity preons. We also show that N = 15 solutions of type I supergravities are locally isometric to Minkowski spacetime. 

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