Global geometry of the supersymmetric AdS_3/CFT_2 correspondence in M-theory

Abstract

We study the global geometry of a general class of spacetimes of relevance to the supersymmetric $Ad{S}_3/CF{T}_2$ correspondence in eleven-dimensional supergravity. Specifically, we study spacetimes admitting a globally-defined ${\mathbb{R}}^{1,1}$ frame, a globally-defined frame bundle with structure group contained in Spin(7), and an $Ad{S}_3$ event horizon or conformal boundary. We show how the global frame bundle may be canonically realised by globally-defined null sections of the spin bundle, which we use to truncate eleven-dimensional supergravity to a gravitational theory of a frame with structure group Spin(7), SU(4) or Sp(2). By imposing an $Ad{S}_3$ boundary condition on the truncated supergravity equations, we define the geometry of all $Ad{S}_3$ horizons or boundaries which can be obtained from solutions of these truncations. In the most generic case we study, we reproduce the most general conditions for an $Ad{S}_3$ manifold in M-theory to admit a Killing spinor. As a consistency check on our definitions of $AdS$ geometries we verify that they are satisfied by known gauged supergravity $Ad{S}_3$ solutions. We discuss future applications of our results.

arXiv comment1+48 pages, 1 figure

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