On the origin of supergravity boundary terms in the AdS/CFT correspondence

Abstract

The standard formulation of the AdS/CFT correspondence is incomplete since it requires adding to a supergravity action some a priori unknown boundary terms. We suggest a modification of the correspondence principle based on the Hamiltonian formulation of the supergravity action, which does not require any boundary terms. Then all the boundary terms of the standard formulation naturally appear by passing from the Hamiltonian version to the Lagrangian one. As examples the graviton part of the supergravity action on the product of AdSd+l with a compact Einstein manifold # and fermions on AdSd+~ are considered. We also discuss conformal transformations of gravity fields on the boundary of AdS and show that they are induced by the isometries of AdS.