The extra dimensions in string theory are supposed to close in on themselves to form circles. Are there other possibilities for compactification? For example a compactification in segment.
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Possible duplicate by OP: https://physics.stackexchange.com/q/600618/2451 – Qmechanic Dec 14 '20 at 21:54
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They don’t form circles. I’m fairly sure that that compactification doesn’t work. See this for what might. – G. Smith Dec 15 '20 at 01:45