Is trivial the antiferromagnetic RP(2) model in four dimensions?
  We study the antiferromagnetic RP(2) model in four dimensions. We find a second order transition with two order parameters, one ferromagnetic and the other antiferromagnetic. The antiferromagnetic sector has mean-field critical exponents and a renormalized coupling which goes to zero in the continuum limit. The exponents of the ferromagnetic channel are not the mean-field ones, but the difference can be interpreted as logarithmic corrections. We perform a detailed analysis of these corrections and conclude the triviality of the continuum limit of this model. 
H.G. Ballesteros, J.M. Carmona, L.A. Fernandez, V. Martin-Mayor, A.   Munoz Sudupe and A. Tarancon