A Comment on Self-Tuning and Vanishing Cosmological Constant in the Brane World
Stefan Forste, Zygmunt Lalak, Stephane Lavignac, Hans Peter Nilles
Abstract
In this note we elaborate on various five dimensional contributions to the effective 4D cosmological constant in brane systems. In solutions with vanishing 5D cosmological constant we describe a non-local mechanism of cancellation of vacuum energy between the brane and the singularities. We comment on a hidden fine tuning which is implied by this observation.