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- TL;DR Summary
- Could inhomogeneties and/or topological defects break the fundamental symmetries of the universe?

I have heard that some types of inhomogeneties and topological defects (like cosmic strings) in cosmology have been proposed to be able to break fundamental symmetries of nature such as the Poincaré, Lorentz, diffeomorphism CPT, spatial/time translational...etc symmetries... However, I have not been able to find any references about this. Is this true? Is there anything about this?