Numerical study of the enlarged O(5) symmetry of the 3-D antiferromagnetic RP2 spin model

Details Numerical study of the enlarged O(5) symmetry of the 3-D antiferromagnetic RP2 spin model Numerical study of the enlarged O(5) symmetry of the 3-D antiferromagnetic RP2 spin model

2005-07-21

arxiv.org/abs/cond-mat/0507491v1

Phys.Lett. B628 (2005) 281-290

Physics

Condensed Matter

Statistical Mechanics

3 postscript figures

Scientific paper

10.1016/j.physletb.2005.09.049

We investigate by means of Monte Carlo simulation and Finite-Size Scaling analysis the critical properties of the three dimensional O(5) non linear sigma model and of the antiferromagnetic RP2 model, both of them regularized on a lattice. High accuracy estimates are obtained for the critical exponents, universal dimensionless quantities and critical couplings. It is concluded that both models belong to the same Universality Class, provide that rather non standard identifications are made for the momentum-space propagator of the RP2 model. We have also investigated the phase diagram of the RP2 model extended by a second-neighbor interaction. A rich phase diagram is found, where most phase transitions are first order.

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