Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-09-21
Condensed Matter Phys. 8 (2005) 87
Physics
High Energy Physics
High Energy Physics - Theory
14 pages
Scientific paper
We consider the critical behavior of the most general system of two N-vector order parameters that is O(N) invariant. We show that it may a have a multicritical transition with enlarged symmetry controlled by the chiral O(2)xO(N) fixed point. For N=2, 3, 4, if the system is also invariant under the exchange of the two order parameters and under independent parity transformations, one may observe a critical transition controlled by a fixed point belonging to the mn model. Also in this case there is a symmetry enlargement at the transition, the symmetry being [SO(N)+SO(N)]xC_2, where C_2 is the symmetry group of the square.
Pelissetto Andrea
Vicari Ettore
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