arXiv subjects

Weijiao He

Publications and source records attributed to Weijiao He.

5 recordsLinked to original sources

arXiv2022

Completely compact Herz-Schur multipliers of dynamical systems

We prove that if $G$ is a discrete group and $(A,G,α)$ is a C*-dynamical system such that the reduced crossed product $A\rtimes_{r,α} G$ possesses property (SOAP) then every completely compact Herz-Schur $(A,G,α)$-multiplier can be approximated in the completely bounded norm by Herz-Schur $(A,G,α)$-multipliers of finite rank. As a consequence, if $G$ has the approximation property (AP) then the completely compact Herz-Schur multipliers of $A(G)$ coincide with the closure of $A(G)$ in the completely bounded multiplier norm. We study the class of invariant completely compact Herz-Schur multipliers of $A\rtimes_{r,α} G$ and provide a description of this class in the case of the irrational rotation algebra.

math.OA↗

arXiv2021

The Bridge Lemmas between Equivalent Fell Bundles and its Applications

In this paper, we prove that the induced representation theories of two equivalent Fell bundles are essentially identical; and we apply our results to carry the induced representation theory and imprimitivity theorems of saturated Fell bundles to arbitrary Fell bundles.

math.OA↗

arXiv2020

Amenability, Nuclearity and Tensor Products of $C^{\ast}$-Algebraic Fell Bundles under the Unified Viewpoint of the Fell-Doran Induced Representation Theory

In this paper we study amenability, nuclearity and tensor products of $C^{\ast}$-Fell bundles by the method of induced representation theory.

math.OA↗

arXiv2020

Compactness of Schur-A Multipliers and Haagerup Tensorproduct

In this paper we study the connection between Haagerup tensor product and compactness of Schur $A$-multiplier. In particular, we give a new characterization of elementary $C^{\ast}$-algebra in terms of completely compact Schur $A$-multiplier.

math.OA↗

arXiv2020

Herz-Schur Multipliers of Fell Bundles

In this paper we develop the notion of Herz-Schur multipliers to the context of Fell bundle, and we give a necessary and sufficient condition if the reduced cross-sectional $C^{\ast}$-algebra $C_r^{\ast}(\mathfrak{B})$ of Fell bundle $\mathfrak{B}$ over discrete group $G$ is nuclear in terms of this generalized notion. As an application, we prove that if $C_r^{\ast}(\mathfrak{B})$ is nuclear, then for any subgroup $H \subset G$, the $C^{\ast}$-algebra $C_r^{\ast}(\mathfrak{B}_H)$ is nuclear.

math.OA↗