title: Classification of supersymmetric spacetimes in eleven dimensions.
abstract: We derive, for spacetimes admitting a Spin(7) structure, the general local bosonic solution of the Killing spinor equation of 11-dimensional supergravity. The metric, four-form, and Killing spinors are determined explicitly, up to an arbitrary eight-manifold of Spin(7) holonomy. It is sufficient to impose the Bianchi identity and one particular component of the four-form field equation to ensure that the solution of the Killing spinor equation also satisfies all the field equations, and we give these conditions explicitly.
authors.affiliation: DAMTP, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom. M.Cariglia@damtp.com.ac.uk
authors.forename: Marco
authors.initials: M
authors.lastname: Cariglia
authors.forename: Oisín A P
authors.initials: OA
authors.lastname: Mac Conamhna