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This document reviews euclidean wormholes and their impact on particle physics and cosmology. It discusses how gravitational instantons can give rise to wormholes that connect different regions of spacetime and potentially create "baby universes". These wormholes could renormalize parameters in the Lagrangian and cause issues related to topology change. More recently, wormholes have been studied for their ability to non-perturbatively break shift symmetries of axions and affect inflation and weak gravity co

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