Speaker
Ioannis Kalogerakis
(University of Bern)
Description
In this talk I will discuss the O(2N) model at criticality in three dimensions in the limit where the charge Q and N are taken to be large. The large-charge expansion turns out to be an asymptotic series and resurgent methods can be applied to obtain an unambiguous semi-classical reconstruction of this expansion. It contains non-perturbative corrections and it allows to extend the validity of the EFT to any value of the charge. Otherwise, this reconstruction can be emanated from a saddle point expansion of worldline path integrals for free particles moving on spheres.
