Critical limit and anisotropy in the two-point correlation function of three-dimensional O(N) models

In three-dimensional O(N) models, we investigate the low-momentum behavior of the two-point Green's function G(x) in the critical region of the symmetric phase. We consider physical systems whose criticality is characterized by a rotational-invariant fixed point. In non-rotational invariant physical systems with O(N)-invariant interactions, the vanishing of space-anisotropy approaching the rotational-invariant fixed point is described by a critical exponent rho, which is universal and is related to the leading irrelevant operator breaking rotational invariance. At N infinity one finds rho = 2. We show that, for all values of N greater than or equal to 0, rho similar or equal to 2. Non-Gaussian corrections to the universal low-momentum behavior of G(x) are evaluated, and found to be very small.