Modular $\mathbb{Z}_2$-Crossed Tambara-Yamagami-like Categories for Even Groups
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866908884730380288 |
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| author | Galindo, César Lentner, Simon Möller, Sven |
| author_facet | Galindo, César Lentner, Simon Möller, Sven |
| contents | We explicitly construct nondegenerate braided $\mathbb{Z}_2$-crossed tensor categories of the form $\operatorname{Vect}_Γ\oplus\operatorname{Vect}_{Γ/2Γ}$. They are $\mathbb{Z}_2$-crossed extensions, in the sense of arXiv:0909.3140, of the braided tensor category $\operatorname{Vect}_Γ$ with $\mathbb{Z}_2$-action given by $-\mathrm{id}$ on the finite, abelian group $Γ$. Thus, we obtain generalisations of the Tambara-Yamagami categories, where now the abelian group $Γ$ may have even order and the nontrivial sector $\operatorname{Vect}_{Γ/2Γ}$ more than one simple object.
The idea for this construction comes from a physically motivated approach in arXiv:2409.16357 to construct $\mathbb{Z}_2$-crossed extensions of $\operatorname{Vect}_Γ$ for any $Γ$ from an infinite Tambara-Yamagami category $\operatorname{Vect}_{\mathbb{R}^d}\oplus\operatorname{Vect}$, which itself is not fully rigorously defined, and then using condensation from $\operatorname{Vect}_{\mathbb{R}^d}$ to $\operatorname{Vect}_Γ$, which we prove commutes with crossed extensions.
The $\mathbb{Z}_2$-equivariantisation of $\operatorname{Vect}_Γ\oplus\operatorname{Vect}_{Γ/2Γ}$ yields new modular tensor categories, which correspond to the orbifold of an arbitrary lattice vertex operator algebra under a lift of $-\mathrm{id}$, as discussed in arXiv:2409.16357. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_12251 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Modular $\mathbb{Z}_2$-Crossed Tambara-Yamagami-like Categories for Even Groups Galindo, César Lentner, Simon Möller, Sven Quantum Algebra Category Theory Representation Theory 18M15, 18M20 We explicitly construct nondegenerate braided $\mathbb{Z}_2$-crossed tensor categories of the form $\operatorname{Vect}_Γ\oplus\operatorname{Vect}_{Γ/2Γ}$. They are $\mathbb{Z}_2$-crossed extensions, in the sense of arXiv:0909.3140, of the braided tensor category $\operatorname{Vect}_Γ$ with $\mathbb{Z}_2$-action given by $-\mathrm{id}$ on the finite, abelian group $Γ$. Thus, we obtain generalisations of the Tambara-Yamagami categories, where now the abelian group $Γ$ may have even order and the nontrivial sector $\operatorname{Vect}_{Γ/2Γ}$ more than one simple object. The idea for this construction comes from a physically motivated approach in arXiv:2409.16357 to construct $\mathbb{Z}_2$-crossed extensions of $\operatorname{Vect}_Γ$ for any $Γ$ from an infinite Tambara-Yamagami category $\operatorname{Vect}_{\mathbb{R}^d}\oplus\operatorname{Vect}$, which itself is not fully rigorously defined, and then using condensation from $\operatorname{Vect}_{\mathbb{R}^d}$ to $\operatorname{Vect}_Γ$, which we prove commutes with crossed extensions. The $\mathbb{Z}_2$-equivariantisation of $\operatorname{Vect}_Γ\oplus\operatorname{Vect}_{Γ/2Γ}$ yields new modular tensor categories, which correspond to the orbifold of an arbitrary lattice vertex operator algebra under a lift of $-\mathrm{id}$, as discussed in arXiv:2409.16357. |
| title | Modular $\mathbb{Z}_2$-Crossed Tambara-Yamagami-like Categories for Even Groups |
| topic | Quantum Algebra Category Theory Representation Theory 18M15, 18M20 |
| url | https://arxiv.org/abs/2411.12251 |