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The Enhancement of Supersymmetry in M-strings
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The Enhancement of Supersymmetry in M-strings
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We study two M5-branes on $A_{1}$ ALE space. We introduce some M2-branes suspended between the M5-branes. Then, the boundaries of M2-branes look like strings. We call them "M-strings". The M-strings have $\mathcal{N}=(4,0)$ supersymmetry by considering the brane configuration on $A_{1}$ ALE space. We calculate the partition function of M-strings by using the refined topological vertex formalism. We find that the supersymmetry of M-strings gets enhanced to $\mathcal{N}=(4,4)$ by tuning some K\"ahler parameters. Furthermore, we discuss another possibility of the enhancement of supersymmetry which is different from the above one.
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