Fredholm Toeplitz operators with VMO symbols and the duality of generalized Fock spaces with small exponents

Fredholm Toeplitz operators with VMO symbols and the duality of generalized Fock spaces with small exponents
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具有 VMO 符号的 Fredholm Toeplitz 算子和小指数广义 Fock 空间的对偶性

DOI:
10.1017/prm.2019.65
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发表时间:
2019-12
期刊:
Proceedings of the Royal Society of Edinburgh: Section A Mathematics
影响因子:
--
通讯作者:
Virtanen Jani A.
Virtanen Jani A.
中科院分区:
其他
文献类型:
--
作者:
Hu Zhangjian;Virtanen Jani A.

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本文在零平均振荡VMO空间中刻画了Toeplitz算子作用在n维复空间的广义Fock空间上的Fredholmness。我们的结果将标准加权Fock空间上Toeplitz算子的最近特征扩展到广义权函数的设置,并且还首次允许VMO中的无界符号。另一个新奇是对小指数0 < p < 1的处理,据我们所知,这在任何函数空间上的Toeplitz算子的Fredholm性质的研究中都没有见到过。我们通过描述具有小指数的广义Fock空间的对偶来实现这一点。
Abstract We characterize Fredholmness of Toeplitz operators acting on generalized Fock spaces of the n-dimensional complex space for symbols in the space of vanishing mean oscillation VMO. Our results extend the recent characterizations for Toeplitz operators on standard weighted Fock spaces to the setting of generalized weight functions and also allow for unbounded symbols in VMO for the first time. Another novelty is the treatment of small exponents 0 < p < 1, which to our knowledge has not been seen previously in the study of the Fredholm properties of Toeplitz operators on any function spaces. We accomplish this by describing the dual of the generalized Fock spaces with small exponents.
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