Rank N (D4,D4) conformal matter on a circle is argued to have affine E8 Weyl symmetry in its brane webs, with 64 distinct sets of invariant Coulomb branch parameters for N ≥ 2.
Elliptic Genus of E-strings
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abstract
We study a family of 2d N=(0,4) gauge theories which describes at low energy the dynamics of E-strings, the M2-branes suspended between a pair of M5 and M9 branes. The gauge theory is engineered using a duality with type IIA theory, leading to the D2-branes suspended between an NS5-brane and 8 D8-branes on an O8-plane. We compute the elliptic genus of this family of theories, and find agreement with the known results for single and two E-strings. The partition function can in principle be computed for arbitrary number of E-strings, and we compute them explicitly for low numbers. We test our predictions against the partially known results from topological strings, as well as from the instanton calculus of 5d Sp(1) gauge theory. Given the relation to topological strings, our computation provides the all genus partition function of the refined topological strings on the canonical bundle over 1/2 K3.
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Weyl symmetry in $(D_4,D_4)$ conformal matter on a circle
Rank N (D4,D4) conformal matter on a circle is argued to have affine E8 Weyl symmetry in its brane webs, with 64 distinct sets of invariant Coulomb branch parameters for N ≥ 2.