|DATE||September 27 (Mon), 2021|
|TITLE||The topologically twisted index of N=4 SU(N) SYM theory and a black hole Farey tail|
In this talk, we investigate the large-N asymptotics of the topologically twisted index of N=4 SU(N) Super-Yang-Mills (SYM) theory on T2×S2 and provide its holographic interpretation based on the black hole Farey tail. In the field theory side, we use the Bethe-Ansatz (BA) formula, which gives the twisted index of N=4 SYM theory as a discrete sum over Bethe vacua, to compute the large-N asymptotics of the twisted index. In a dual N=2 gauged STU model, we construct a family of 5d extremal solutions uplifted from the 3d black hole Farey tail, and compute the regularized on-shell actions. The gravitational partition function given in terms of these regularized on-shell actions is then compared with a canonical partition function derived from the twisted index by the inverse Laplace transform, in the large-N limit. This extends the previous microstate counting of an AdS5 black string by the twisted index and thereby improves holographic understanding of the twisted index. Lastly, we discuss future research directions.