  A new variant of the Wolff cluster algorithm is proposed for simulating
systems with competing interactions. This method is used in a high-precision
study of the Lifshitz point of the 3D ANNNI model. At the Lifshitz point,
several critical exponents are found and the anisotropic scaling of the
correlators is verified. The functional form of the two-point correlators is
shown to be consistent with the predictions of generalized conformal
invariance.
