The Cosmological Constant and the Deconstruction of Gravity
arXiv:hep-th/0212057 · doi:10.1016/S0370-2693(03)00101-1
Abstract
Witten has presented an argument for the vanishing of the cosmological constant in 2+1 dimensions. This argument is crucially tied to the specific properties of (2+1)-dimensional gravity. We argue that this reasoning can be deconstructed to 3+1 dimensions under certain conditions. Our observation is also tied to a possibility that there exists a well-defined UV completion of (3+1)-dimensional gravity.
LaTeX, 17 pages; references added, arguments clarified, discussion on the scaling of entropy added
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