Title: "Holographic description of two-brane models with an Anti-de Sitter bulk"
Some time ago S. Gubser constructed the effective action for the
Randall-Sundrum one-brane model from the holographic stress-energy tensor
of the boundary conformal field theory in the AdS/CFT correspondence.
However, this procedure was incomplete in the respect that it left open an
ambiguity in the quadratic-in-curvature part of the effective action. This
ambiguity is tied to the nonlocal nature of the four-dimensional effective
action in terms of on-brane fields. The talk reviews this work and extends
it to two-brane models of arbitrary brane tensions in an Anti-de Sitter
bulk. In the case of two branes the ambiguity is not present in the limit
of small brane distance and the effective action is completely local. The
effective actions for the two branes are found to be conformally related
to each other. We discuss cosmological implications of the effective
action and the interpretation of the two-brane system in terms of the