Extension of symmetries on Einstein manifolds with boundary

Mathematics – Differential Geometry

Scientific paper

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final version, to appear in Selecta Math.

Scientific paper

We investigate the validity of the isometry extension property for (Riemannian) Einstein metrics on manifolds with boundary. Given a metric on the boundary, this is the issue of whether any Killing field of the boundary metric extends to a Killing field of any bulk or filling Einstein metric inducing the given data on the boundary. Under a mild condition on the fundamental group, this is proved to be the case at least when the Killing field preserves the mean curvature of the boundary.

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