Modular extension of topological orders from congruence representations

We present an efficient method to compute the modular extension of both fermionic topological orders and \(\mathbb{Z}_2\)-symmetric bosonic topological orders in two spatial dimensions, basing on congruence representations of \(\mathrm{SL}_2(\mathbb{Z})\) and its subgroups. To demonstrate the validi...

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Published in:arXiv.org 2023-12
Main Authors: Seo, Donghae, You, Minyoung, Gil Young Cho, Hee-Cheol, Kim
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description We present an efficient method to compute the modular extension of both fermionic topological orders and \(\mathbb{Z}_2\)-symmetric bosonic topological orders in two spatial dimensions, basing on congruence representations of \(\mathrm{SL}_2(\mathbb{Z})\) and its subgroups. To demonstrate the validity of our approach, we provide explicit calculations for topological orders with rank up to 10 for the fermionic cases and up to 6 for the bosonic cases. Along the way, we clarify the relation between fermionic rational conformal field theories, which live on the boundary of the corresponding fermionic topological orders, and modular extensions. In particular, we show that the \(\mathrm{SL}_2(\mathbb{Z})\) representation of the R-R sector can be determined from the NS-NS sector using the modular extensions.
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subjects Representations
Subgroups
Topology
title Modular extension of topological orders from congruence representations
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