High Energy Theory Seminar

Properties of CFT operators carrying some large global charge can be systematically computed in a 1/Q expansion by assuming that the corresponding states on the cylinderare described by a supefluid phase. In particular one can compute the spectrum of such “heavy" operators and the heavy-heavy-light fusion coefficients. The key to computational control is the effective field theory for the superfluid phase. This is universally described by a goldstone boson in a systematic derivative expansion, which corresponds to the 1/Q expansion. By plausibly assuming that the superfluid supports vortex excitations one can also derive properties of the operators carrying both large charge and large spin.