Compact operators via the Berezin transform
نویسندگان
چکیده
منابع مشابه
Compact Operators via the Berezin Transform
In this paper we prove that if S equals a finite sum of finite products of Toeplitz operators on the Bergman space of the unit disk, then S is compact if and only if the Berezin transform of S equals 0 on ∂D. This result is new even when S equals a single Toeplitz operator. Our main result can be used to prove, via a unified approach, several previously known results about compact Toeplitz oper...
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We prove that the boundedness and compactness of the Toeplitz operator on the Bergman space with a BMO 1 symbol is completely determined by the boundary behaviour of its Berezin transform. This result extends the known results in the cases when the symbol is either a positive L 1-function or an L ∞ function. 1. Introduction. Toeplitz operators are one of the most widely studied classes of concr...
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We show that the Berezin transform associated to the harmonic Fock (Segal-Bargmann) space on Cn has an asymptotic expansion analogously as in the holomorphic case. The proof involves a computation of the reproducing kernel, which turns out to be given by one of Horn’s hypergeometric functions of two variables, and an ad hoc determination of the asymptotic behaviour of the resulting integrals, t...
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Improving upon a recent result of L. Coburn and J. Xia, we show that for any bounded linear operator T on the Segal-Bargmann space, the Berezin transform of T is a function whose partial derivatives of all orders are bounded. Similarly, if T is a bounded operator on any one of the usual weighted Bergman spaces on a bounded symmetric domain, then the appropriately defined “invariant derivatives”...
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ژورنال
عنوان ژورنال: Indiana University Mathematics Journal
سال: 1998
ISSN: 0022-2518
DOI: 10.1512/iumj.1998.47.1407