In this paper we study the Fredholm properties of Toeplitz operators acting on weighted Bergman spaces $$A^p_{\nu }(\mathbb {B}^n)$$ A ν p ( B n ) , where $$p \in (1,\infty )$$ p ∈ ( 1 , ∞ ) and $$\mathbb {B}^n \subset \mathbb {C}^n$$ B n ⊂ C n denotes the n-dimensional open unit ball. Let f be a continuous function on the Euclidean closure of $$\mathbb {B}^n$$ B n . It is well-known that then the corresponding Toeplitz operator $$T_f$$ T f is Fredholm if and only if f has no zeros on the boundary $$\partial \mathbb {B}^n$$ ∂ B n . As a consequence, the essential spectrum of $$T_f$$ T f is given by the boundary values of f. We extend this result to all operators in the algebra generated by Toeplitz operators with bounded symbol (in a sense to be made precise down below). The main ideas are based on the work of Suárez et al. (Integral Equ Oper Theory 75:197–233, 2013, Indiana Univ Math J 56(5):2185–2232, 2007) and limit operator techniques coming from similar problems on the sequence space $$\ell ^p(\mathbb {Z})$$ ℓ p ( Z ) (Hagger et al. in J Math Anal Appl 437(1):255–291, 2016; Lindner and Seidel in J Funct Anal 267(3):901–917, 2014; Rabinovich et al. Integral Equ Oper Theory 30(4): 452–495, 1998 and references therein).
Integral Equations and Operator Theory – Springer Journals
Published: Sep 6, 2017
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