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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