The antiferromagnetic φ 4 Model , I . The Mean-field Solution

Certain higher dimensional operators of the lagrangian may render the vacuum inhomogeneous. A rather rich phase structure of the φ scalar model in four dimensions is presented by means of the mean-field approximation. One finds paraferroferriand antiferromagnetic phases and commensurateincom-mesurate transitions. There are several particles described by the… (More)