$L^{p}$ regularity of weighted Bergman projection on Fock-Bargmann-Hartogs domain

TL;DR

This paper investigates the $L^p$ regularity of weighted Bergman projections on the unbounded Fock-Bargmann-Hartogs domain, revealing unboundedness for all $p$ except 2, contrasting with known results on bounded domains.

Contribution

It provides the first example of an unbounded strongly pseudoconvex domain with $L^p$ irregularity of the Bergman projection for all $p eq 2$, and computes the weighted Bergman kernel explicitly.

Findings

Weighted Bergman kernel computed explicitly.

Weighted Bergman projection unbounded on $L^p$ for $p eq 2$.

Contrasts with regularity on bounded strongly pseudoconvex domains.

Abstract

The Fock-Bargmann-Hartogs domain $D_{n, m}(\mu)$ is defined by $$ D_{n, m}(\mu):=\{(z, w)\in\mathbb{C}^{n}\times\mathbb{C}^m:\Vert w \Vert^2<e^{-\mu\Vert z \Vert^2}\},$$ where $\mu>0.$ The Fock-Bargmann-Hartogs domain $D_{n, m}(\mu)$ is an unbounded strongly pseudoconvex domain with smooth real-analytic boundary. In this paper, we first compute the weighted Bergman kernel of $D_{n, m}(\mu)$ with respect to the weight $(-\rho)^{\alpha}$, where $\rho(z,w):=\|w\|^2-e^{-\mu \|z\|^2}$ is a defining function for $D_{n, m}(\mu)$ and $\alpha>-1$. Then, for $p\in [1,\infty),$ we show that the corresponding weighted Bergman projection $P_{D_{n, m}(\mu), (-\rho)^{\alpha}}$ is unbounded on $L^p(D_{n, m}(\mu), (-\rho)^{\alpha})$, except for the trivial case $p=2$. In particular, this paper gives an example of an unbounded strongly pseudoconvex domain whose ordinary Bergman projection is $L^p$ irregular when $p\in [1,\infty)\setminus\{2\}$. This result turns out to be completely different from the well-known positive $L^p$ regularity result on bounded strongly pseudoconvex domain.