I think I have a relatively decent grasp on T-duality where we've compactified [itex] S^{1} [/itex]. However, when compactifying a 2-torus, is the T-duality transformation where you invert(adsbygoogle = window.adsbygoogle || []).push({}); bothradii of the two circles simultaneously, or is the claim that you can invert one of the two, leaving the other fixed, and yield the same physics?

I suspect that it's the second choice. If indeed this is the case, is there anything at all special about the case where you invert both radii simultaneously? I believe this is equivalent to merely interchanging the A-cycle and B-cycle on the torus.

Thanks in advance :)

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# T-Duality on Torus

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