^{1} Department of Mathematics, Science and Technology, Aarhus University^{2} Department of Mathematics, Science and Technology, Aarhus University

Abstract:

We investigate the heat equation corresponding to the Bessel operators on a symmetric cone $Ω=G/K$. These operators form a one-parameter family of elliptic self-adjoint second order differential operators and occur in the Lie algebra action of certain unitary highest weight representations. The heat kernel is explicitly given in terms of a multivariable $I$-Bessel function on $Ω$. Its corresponding heat kernel transform defines a continuous linear operator between $L^p$-spaces. The unitary image of the $L^2$-space under the heat kernel transform is characterized as a weighted Bergmann space on the complexification $G_{\mathbb C}/K_{\mathbb C}$ of $Ω$, the weight being expressed explicitly in terms of a multivariable $K$-Bessel function on $Ω$. Even in the special case of the symmetric cone $Ω=\mathbb{R}_+$ these results seem to be new.

Type:

Journal article

Language:

English

Published in:

Journal of Lie Theory, 2014, Vol 24, Issue 2, p. 373-396