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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$\begingroup$ Possible duplicate by OP: physics.stackexchange.com/q/600618/2451 $\endgroup$– Qmechanic ♦Dec 14, 2020 at 21:54
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$\begingroup$ They don’t form circles. I’m fairly sure that that compactification doesn’t work. See this for what might. $\endgroup$– G. SmithDec 15, 2020 at 1:45
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