# Euclidean wormholes Euclidean wormholes are Euclidean metrics that connect more than one asymptotic Euclidean geometry. They are *not* the same as spatial wormholes, which are Lorentzian solutions with more than one asymptotic boundary, such as the AdS Schwarzschild black hole. These solutions lead to the Euclidean factorisation problem, which is distinct from the [[0514 Lorentzian factorisation problem|Lorentzian factorisation problem]] (though it might be related). ## Refs - [[2004#Maldacena, Maoz]] - [[Arkani-HamedOrgeraPolchinski2007]] - in string theory - [[2021#Cotler, Jensen]] - [[2021#Marolf, Santos]]: many examples - [[2025#Maloney, Meruliya, Van Raamsdonk]]: ordinary wormholes (no exotic matter) obtained via analytic continuation from FRW universes