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Weak Hopf tube algebra for domain walls between 2d gapped phases of Turaev-Viro TQFTs
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Journal Article
Weak Hopf tube algebra for domain walls between 2d gapped phases of Turaev-Viro TQFTs
2025
Overview
A
bstract
We investigate domain walls between 2
d
gapped phases of Turaev-Viro type topological quantum field theories (TQFTs) by constructing domain wall tube algebras. We begin by analyzing the domain wall tube algebra associated with bimodule categories, and then extend the construction to multimodule categories over
N
base fusion categories. We prove that the resulting tube algebra is naturally equipped with a
C
∗
weak Hopf algebra structure. We show that topological excitations localized on domain walls are classified by representations of the corresponding domain wall tube algebra, in the sense that the functor category of bimodules admits a fusion-preserving embedding into the representation category of the domain wall tube algebra. We further establish the folding trick and Morita theory in this context. Then, most crucially, we provide a rigorous construction of the Drinfeld quantum double from weak Hopf boundary tube algebras using a skew-pairing, and establish an isomorphism between domain wall tube algebra and Drinfeld quantum double of boundary tube algebras. Motivated by the correspondence between the domain wall tube algebra and the quantum double of the boundary tube algebras, we introduce the notion of an
N
-tuple algebra and demonstrate how it arises in the multimodule domain wall setting. Finally, we consider defects between two domain walls, showing that such defects can be characterized by representations of a domain wall defect tube algebra. We briefly outline how these defects can be systematically treated within this representation-theoretic framework.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V,SpringerOpen
