Remote Nordic HET seminar: Susanne Reffert

Speaker: Susanne Reffert

Title: Compensating strong coupling with large charge

Abstract: Over the last few years, it has become clear that working in sectors of large global charge leads to significant simplifications when studying strongly coupled CFTs, theories which are otherwise often inaccessible to analytic methods. It allows us in particular to calculate the CFT data as an expansion in inverse powers of the large charge.
In this talk, I will introduce the large-charge expansion via the simple example of the O(2) model and will then apply it to a number of other systems which display a richer structure, such as those with non-Abelian global symmetry groups.