## Holomorphic Differentials in Mathematics and Physics

**Date:**
12 August - 13 December 2019

**Location: ** MSRI

**Event type:**
Extended Format

**Organisers: ** Jayadev Athreya (Washington), Steven Bradlow (Illinois, Urbana-Champaign), Sergei Gukov (Caltech), Andrew Neitzke (Texas, Austin), Anna Wienhard (Heidelberg), Anton Zorich (Jussieu)

**Website:**www.msri.org/programs/310

Holomorphic differentials on Riemann surfaces have long held a distinguished place in low dimensional geometry, dynamics and representation theory. Recently it has become apparent that they constitute a common feature of several other highly active areas of current research in mathematics and also at the interface with physics. In some cases the areas themselves (such as stability conditions on Fukaya-type categories, links to quantum integrable systems, or the physically derived construction of so-called spectral networks) are new, while in others the novelty lies more in the role of the holomorphic differentials (for example in the study of billiards in polygons, special – Hitchin or higher Teichmuller – components of representation varieties, asymptotic properties of Higgs bundle moduli spaces, or in new interactions with algebraic geometry).

It is remarkable how widely scattered are the motivating questions in these areas, and how diverse are the backgrounds of the researchers pursuing them. Bringing together experts in this wide variety of fields to explore common interests and discover unexpected connections is the main goal of our program. Our program will be of interest to those working in many different elds, including low-dimensional dynamical systems (via the connection to billiards); differential geometry (Higgs bundles and related moduli spaces); and different types of theoretical physics (electron transport and supersymmetric quantum field theory).

Professor Anna Wienhard (Heidelberg) has been appointed as a Clay Senior Scholar to participate in this program.

Image: Some holomorphic differentials on a genus 2 surface, with close up views of singular points, courtesy Jian Jiang.