Key points are not available for this paper at this time.
A critical exponent associated with arbitrary hyperspherical harmonic perturbations of a generalized Heisenberg spin system is calculated to order epsilon 3 as well as 1/n. Some previous results and many new ones are contained as particular cases. High harmonic interactions are found to be generally irrelevant in the phase transition region, confirming the extent of universality.
Wallace et al. (1975) studied this question.