Analytic 𝑚-isometries without the wandering subspace property

Author:

Anand Akash,Chavan Sameer,Trivedi Shailesh

Abstract

The wandering subspace problem for an analytic norm-increasing m m -isometry T T on a Hilbert space H \mathcal {H} asks whether every T T -invariant subspace of H \mathcal {H} can be generated by a wandering subspace. An affirmative solution to this problem for m = 1 m=1 is ascribed to Beurling-Lax-Halmos, while that for m = 2 m=2 is due to Richter. In this paper, we capitalize on the idea of weighted shift on a one-circuit directed graph to construct a family of analytic cyclic 3 3 -isometries which do not admit the wandering subspace property and which are norm-increasing on the orthogonal complement of a one-dimensional space. Further, on this one-dimensional space, their norms can be made arbitrarily close to 1 1 . We also show that if the wandering subspace property fails for an analytic norm-increasing m m -isometry, then it fails miserably in the sense that the smallest T T -invariant subspace generated by the wandering subspace is of infinite codimension.

Funder

Department of Science and Technology, Ministry of Science and Technology

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

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