Generalized Gaussian Estimates and Local Limit Theorems for Discrete Convolution Powers of Complex Functions: The $d$-dimensional case

We establish generalized Gaussian estimates and local limit theorems with cumulants, up to any order of accuracy, with sharp Gaussian-type error for the convolution powers of certain complex-valued functions on $\mathbb{Z}^d$.

These global space-time estimates/error are written in terms of the Legendre-Fenchel transforms of positive-homogeneous polynomials and are mirrored by estimates satisfied by the heat kernels associated to a related class of partial differential operators.

The results obtained here enjoy applications to the analysis and stability of numerical difference schemes to partial differential equations.

This work extends several recent results, pertaining to one and several dimensions, of P.

Diaconis, L.

Saloff-Coste, J.-F.

Coulombel, G.

Faye, L.

Coeuret, and the second author.