Random weighted shifts
Random weighted shifts
复制标题
随机加权移位
DOI:
10.1016/j.jfa.2018.11.006
复制
发表时间:
2018-11
影响因子:
1.7
通讯作者:
Zhu Sen
中科院分区:
文献类型:
--
作者:
Cheng Guozheng;Fang Xiang;Zhu Sen
In this paper we initiate the study of a fundamental yet untapped random model of non-selfadjoint, bounded linear operators acting on a separable complex Hilbert space. We replace the weights w n= 1 in the classical unilateral shift T, defined as T e n= w n e n+ 1, where {e n} n= 1∞ form an orthonormal basis of a complex Hilbert space, by a sequence of iid random variables {X n} n= 1∞; that is, w n= X n. This paper answers basic questions concerning such a model. We propose that this model can be studied in comparison with the classical Hardy/Bergman/Dirichlet spaces in function-theoretic operator theory. We calculate the spectra and determine their fine structures (Section 3). We classify the samples up to four equivalence relationships (Section 4). We introduce a family of random Hardy spaces and determine the growth rate of the coefficients of analytic functions in these spaces (Section 5). We compare them with three types of classical operators (Section 6); this is achieved in the form of generalized von Neumann inequalities. The invariant subspaces are shown to admit arbitrarily large indices and their semi-invariant subspaces model arbitrary contractions almost surely. We discuss a Beurling-type theorem (Section 7). We determine various non-selfadjoint algebras generated by T (Section 8). Their dynamical properties are clarified (Section 9). Their iterated Aluthge transforms are shown to converge (Section 10). In summary, they provide a new random model from the viewpoint of probability theory, and they provide a new class of analytic functional Hilbert spaces from the viewpoint of operator theory. The technical novelty in this paper is that the methodology used draws from three (largely separate) sources: probability theory, functional Hilbert spaces, and the approximation theory of bounded operators.
登录
查看更多内容
影响因子:
0.9
作者:
H. Hedenmalm;Kehe Zhu
通讯作者:
H. Hedenmalm;Kehe Zhu
DOI:
--
发表时间:
1986
期刊:
--
影响因子:
--
作者:
A. Gut
通讯作者:
A. Gut
DOI:
10.1112/jlms/s1-43.1.565a
发表时间:
1968
影响因子:
1.2
作者:
F. Smithies
通讯作者:
F. Smithies
DOI:
10.1090/fim/006
发表时间:
1996
期刊:
--
影响因子:
--
作者:
K. Davidson
通讯作者:
K. Davidson
影响因子:
0.6
作者:
D. Sarason
通讯作者:
D. Sarason