Note on gravity at the boundary of an AdS vacuum

Abstract

In this note, I describe an attempt to construct a phenomenological gravitational model at the boundary of the AdS manifold from the variation of boundary terms in the gravitational action. I find that for an AdS vacuum in the bulk, geometric constraints require that the energy-momentum tensor has constant trace.

arXiv comment3 pages. Added reference, changes to title and abstract. The author was made aware of a result that changed the conclusions