We provide a complete description of anisotropic scaling limits of stationary linear random field on ${ \mathbb { Z}}^3$ with long-range dependence and moving average coefficients decaying as $O(|t_i|^{ -q_i})$ in the $i$th direction, $i=1,2,3.$ The scaling limits are taken over rectangles in ${ \mathbb { Z}}^3$ whose sides increase as $O(\lambda^{ \gamma_i}), i=1,2,3$ when $\lambda \to \infty$, for any fixed $\gamma_i >0, i=1,2,3 $. We prove that all these limits are Gaussian RFs whose covariance structure essentially is determined by the fulfillment or violation of the balance conditions $\gamma_i q_i = \gamma_j q_j, 1 \le i < j \le 3$. The paper extends recent results in \cite{ ps2015}, \cite{ ps2016}, \cite{ pils2016}, \cite{ pils2017} on anisotropic scaling of long-range dependent random fields from dimension 2 to dimension 3.
Categories: math.PR