# Critical behavior of O(2)⊗O(N) symmetric models

@article{Calabrese2004CriticalBO, title={Critical behavior of O(2)⊗O(N) symmetric models}, author={Pasquale Calabrese and Pietro Parruccini and Andrea Pelissetto and Ettore Vicari}, journal={Physical Review B}, year={2004}, volume={70}, pages={174439} }

We investigate the controversial issue of the existence of universality
classes describing critical phenomena in three-dimensional statistical systems
characterized by a matrix order parameter with symmetry O(2)xO(N) and
symmetry-breaking pattern O(2)xO(N) -> O(2)xO(N-2). Physical realizations of
these systems are, for example, frustrated spin models with noncollinear order.
Starting from the field-theoretical Landau-Ginzburg-Wilson Hamiltonian, we
consider the massless critical theory…

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