Compensating strong coupling with large charge

by Susanne Reffert

Tuesday 5 Mar 2019, 14:00 → 16:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

The large-charge approach consists in studying conformal field theories in sectors of fixed and large global charge. This allows performing a perturbative expansion of a generically strongly coupled theory with the inverse charge acting as a controlling parameter. In this talk, I will present the basic idea of the large quantum number expansion. I will show the simplest example of the 3D O(2) model at the Wilson-Fisher fixed point at large global charge and then extend its treatment to the O(2N) vector model. New lattice results confirm our predictions to high accuracy.
I will further show that the large-charge expansion can also be successfully applied to non-relativistic CFTs.