Critical properties of the Antiferromagnetic \RP2$ model in three   dimensions
  We study the behavior of the antiferromagnetic RP$^2$ model in $d=3$. The vacuum structure is analyzed in the critical and low temperature regions, paying special attention to the spontaneous symmetry breaking pattern. Near the critical point we observe a full breakdown of the O(3) symmetry of the action. Several methods for computing critical exponents are compared. We conclude that the most solid determination is obtained using a measure of the correlation length. Corrections-to-scaling are parameterized, yielding a very accurate determination of the critical coupling and a 5\% error measure of the related exponent. This is used to estimate the systematic errors due to finite-size effects. 
H.G. Ballesteros, L.A. Fernandez, V. Martin-Mayor, and A. Munoz Sudupe   (Departamento de Fisica Teorica I, Universidad Comp...