Joint Theory Seminar: Atul Sharma

Title: Advances in top-down celestial holography

Abstract: I will describe recent advances in engineering examples of celestial holography in topological string theory. The main setup I will discuss is self-dual Yang-Mills theory on an asymptotically flat 4-manifold called Burns space. This can be expressed as a topological B-model on twistor space. Twisted holography relates this to the large N limit of a 2d gauge theory living on a stack of D1 branes. Through 2- and 3-point examples, I will discuss how the CFT dual drastically simplifies the computation of scattering amplitudes of positive helicity gluons on Burns space.