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Minkowski Functionals are a powerful tool for analyzing large scalestructure, in particular if the distribution of matter is highly non-Gaussian,as it is in models in which cosmic strings contribute to structure formation.Here we apply Minkowski functionals to 21cm maps which arise if structure isseeded by a scaling distribution of cosmic strings embeddded in backgroundfluctuations, and then test for the statistical significance of the cosmicstring signals using the Fisher combined probability test. We find that thismethod allows for detection of cosmic strings with $G \mu > 5 \times 10^{-8}$,which would be improvement over current limits by a factor of about 3.

Searching for Signatures of Cosmic String Wakes in 21cm Redshift Surveys using Minkowski Functionals