Extra Dimensions and the Cosmological Constant Problem

Abstract

This article reviews the arguments why extra dimensions provide a unique opportunity for progress on the cosmological constant problem, and updates the status of -- and the objections to (with replies) -- the specific proposal using supersymmetric large extra dimensions (SLED).

Comments: Contribution to the proceedings of the Rencontres de Moriond "Electroweak Interactions and Unified Theories", March 2007. 8 pages