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Message: <blockquote data-quote="freyar" data-source="post: 6738927" data-attributes="member: 40227">So true...Well, less exotic spacetimes, like Kerr black holes, also have CTCs.  But they tend to be tucked behind horizons or where the matter that forms the black hole would be instead.I think cosmic strings should be safe because they* don't rotate on their axis.  Or rather that rotation isn't physical.  *I'm assuming the cosmic strings come from a gauge symmetry breaking** since global symmetry breaking tends to make infinite string tensions and global symmetries don't seem to exist in quantum gravity.  **And my statement might be more general anyway, but I'd have to go digging through textbooks to check.</blockquote>