# Revista Matemática Iberoamericana

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**Volume 26, Issue 2, 2010, pp. 693–706**

**DOI: 10.4171/RMI/614**

Published online: 2010-08-31

Toeplitz operators on Bergman spaces with locally integrable symbols

Jari Taskinen^{[1]}and Jani Virtanen

^{[2]}(1) University of Helsinki, Finland

(2) University of Helsinki, Finland

Given a calibrated Riemannian manifold $\overline{M}$ with parallel calibration $\Omega$ of rank $m$ and $M$ an orientable m-submanifold with parallel mean curvature $H$, we prove that if $\cos\theta$ is bounded away from zero, where $\theta$ is the $\Omega$-angle of $M$, and if $M$ has zero Cheeger constant, then $M$ is minimal. In the particular case $M$ is complete with $Ricci^M\geq 0$ we may replace the boundedness condition on $\cos\theta$ by $\cos\theta\geq Cr^{-\beta}$, when $r\rightarrow+\infty$, where $0 < \beta < 1$ and $C > 0$ are constants and $r$ is the distance function to a point in $M$. Our proof is surprisingly simple and extends to a very large class of submanifolds in calibrated manifolds, in a unified way, the problem started by Heinz and Chern of estimating the mean curvature of graphic hypersurfaces in Euclidean spaces. It is based on an estimation of $\|H\|$ in terms of $\cos\theta$ and an isoperimetric inequality. In a similar way, we also give some conditions to conclude $M$ is totally geodesic. We study some particular cases.

*Keywords: *Toeplitz operators, Bergman spaces, boundedness, compactness, Fredholm properties

Taskinen Jari, Virtanen Jani: Toeplitz operators on Bergman spaces with locally integrable symbols. *Rev. Mat. Iberoamericana* 26 (2010), 693-706. doi: 10.4171/RMI/614