On the integral kernels of derivatives of the Ornstein-Uhlenbeck semigroup

Abstract

This paper presents a closed-form expression for the integral kernels associated with the derivatives of the Ornstein-Uhlenbeck semigroup $e^{tL}$. Our approach is to expand the Mehler kernel into Hermite polynomials and applying the powers $L^N$ of the Ornstein-Uhlenbeck operator to it, where we exploit the fact that the Hermite polynomials are eigenfunctions for $L$. As an application we give an alternative proof of the kernel estimates by Portal [2014], making all relevant quantities explicit.

Published as: J. Teuwen, On the integral kernels of derivatives of the Ornstein-Uhlenbeck semigroup, Infin. Dimens. Anal. Quantum Probab. Relat. Top. 19 (2016) 1650030, doi: 10.1142/S0219025716500302