Toeplitz operators with PC symbols on general Carleson Jordan curves with arbitrary Muckenhoupt weights

A Böttcher, Y Karlovich - Transactions of the American Mathematical …, 1999 - ams.org
Transactions of the American Mathematical Society, 1999ams.org
We describe the spectra and essential spectra of Toeplitz operators with piecewise
continuous symbols on the Hardy space $ H^ p (\Gamma,\omega) $ in case $1< p<\infty $,
$\Gamma $ is a Carleson Jordan curve and $\omega $ is a Muckenhoupt weight in $ A_p
(\Gamma) $. Classical results tell us that the essential spectrum of the operator is obtained
from the essential range of the symbol by filling in line segments or circular arcs between the
endpoints of the jumps if both the curve $\Gamma $ and the weight are sufficiently nice. Only …
Abstract
We describe the spectra and essential spectra of Toeplitz operators with piecewise continuous symbols on the Hardy space in case , is a Carleson Jordan curve and is a Muckenhoupt weight in . Classical results tell us that the essential spectrum of the operator is obtained from the essential range of the symbol by filling in line segments or circular arcs between the endpoints of the jumps if both the curve and the weight are sufficiently nice. Only recently it was discovered by Spitkovsky that these line segments or circular arcs metamorphose into horns if the curve is nice and is an arbitrary Muckenhoupt weight, while the authors observed that certain special so-called logarithmic leaves emerge in the case of arbitrary Carleson curves with nice weights. In this paper we show that for general Carleson curves and general Muckenhoupt weights the sets in question are logarithmic leaves with a halo, and we present final results concerning the shape of the halo. References
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