Oleg Lisovyy (Université de Tours)
Tuesday, November 30, 2021 15:30to16:30
Title: Accessory parameters in Heun equations and classical conformal blocks.
Abstract: We will discuss accessory parameters of Floquet type in the Heun equation and some of its confluent versions. A conjecture by Zamolodchikov relates them to quasiclassical limit of conformal blocks of the Virasoro algebra. I will explain an extension of this conjectural relation to another class of accessory parameter functions that are defined by inverting all-order Bohr-Sommerfeld periods for the confluent and biconfluent Heun equation.