By Arjun Dey
We introduce a general method for investigating O(N) criticality with truncated quantum rotor models, specialising in the O(3) model on a fuzzy sphere. Applying conformal perturbation theory, we locate the critical point, compute scaling dimensions via the state-operator correspondence, and extract operator product expansion (OPE) coefficients from finite-size effects, essentially turning noise into signal. Our investigation reveals a range of new operators, including an O(3) pseudoscalar Lorentz pseudovector, which resolves a long-standing puzzle in the critical exponents of dimerised antiferromagnets. Furthermore, the appearance of the stress-energy tensor and the conserved Noether current in the spectrum validate the presence of conformal symmetry.
By Anders Sandvik
By Giulia Fardelli
By Andreas Läuchli
By Igor Herbut
By Subir Sachdev
By Christian Voinea
By Max Metliski
By Mykola Dedushenko
By Ruihua Fan
By Francesco Parisen-Toldin
By Zheng Zhou
By Johannes Hofman
By Giulio Biroli
By Giulio Biroli
