RENORMALIZATION OF THE ISING-MODEL IN A TRANSVERSE FIELD

The renormalization scheme recently proposed by White is applied to th e Ising model in a transverse field. It is found that this scheme is a significant improvement over standard techniques as far as the comput ation of the ground state is concerned. It is shown that the errors in , the ground state energy are the largest in the neighborhood of the p hase transition. Thus, this method has no special virtue in predicting the location of the phase transition and its associated critical expo nents.