A bstract We revisit the minimal tension (k= 1) string theory on AdS 3× S 3× 𝕋 4. We propose
a new free-field description of the worldsheet theory and show how localization of string …

We construct a conformal field theory dual to string theory on AdS 3 with pure NS–NS flux. It
is given by a symmetric orbifold of a linear dilaton theory deformed by a marginal operator …

A bstract A solvable irrelevant deformation of AdS 3/CFT 2 correspondence leading to a
theory with Hagedorn spectrum at high energy has been recently proposed. It consists of a …

We study Nekrasov's instanton partition function of four-dimensional N= 2 gauge theories in
the presence of surface operators. This can be computed order by order in the instanton …

A bstract Constructing a holographic string theory dual for a CFT in the perturbative, weakly
coupled regime is a holy grail for gauge/string dualities that would not only open the door for …

We describe the moduli space of SU (N) instantons in the presence of a general surface
operator of type N= n 1+⋯+ n M in terms of the representations of the so-called chain-saw …

A bstract We revisit the computation of string worldsheet correlators on Euclidean AdS 3 with
pure NS-NS background. We compute correlation functions with insertions of spectrally …

A bstract The relationship of two dimensional quantum field theory and isomonodromic
deformations of Fuchsian systems has a long history. Recently four-dimensional N= 2 gauge …

A bstract We propose a closed-form formula for genus 0 four-point functions in AdS 3 string
theory with pure NS-NS flux including arbitrary amounts of spectral flow. Our formula passes …

We discuss the relation between Liouville theory and the Hitchin integrable system, which
can be seen in two ways as a two step process involving quantization and hyperkähler …