WORMHOLES, NON-LOCAL ACTIONS AND A NEW MECHANISM FOR SUPPRESSING THE COSMOLOGICAL CONSTANT

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Abstract
The connection between wormholes and non-local actions is clarified. Baum-HawkingColeman type singularities correspond to runaway vacua of unbounded actions and can be avoided by appropriate sign flips and/or integration contour rotations. Sticking to saddle points, we find a new mechanism suppressing exponentially the cosmological constant without affecting appreciably other gravitational couplings.

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