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What is NS5 brane?

Is it possible (in analogy with D-brane) understand appearance of NS5 brane in perturbative string spectrum?

Why D-brane can be attached to NS5 branes?

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  • $\begingroup$ It is related to M-theory. NS5-brane is M5-brane not wrapped around 11th dimension. $\endgroup$ – Mitchell Porter Oct 17 '19 at 6:40

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