M-Strings

Understand

M2 branes suspended between adjacent parallel M5 branes lead to light strings, the `M-strings'.

• In this paper we compute the elliptic genus of M-strings, twisted by maximally allowed symmetries that preserve 2d (2,0) supersymmetry.
• In a codimension one subspace of parameters this reduces to the elliptic genus of the (4,4) supersymmetric A_{n-1} quiver theory in 2d.
• We contrast the elliptic genus of N M-strings with the (4,4) sigma model on the N-fold symmetric product of R^4.