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Shoma Sugimoto

Publications and source records attributed to Shoma Sugimoto.

8 recordsLinked to original sources
arXiv2026

A Lie algebraic pattern behind logarithmic CFTs

We introduce a purely Lie algebraic formalization of the Feigin--Tipunin's geometric construction of logarithmic CFTs/VOAs. After reformulating the geometric representation theory of FT construction under this new setting, within this framework, we uniformly construct the (multiplet) principal W-algebras at positive integer level associated with any simple Lie algebra $\mathfrak{g}$ and Lie superalgebra $\mathfrak{osp}(1|2r)$, thereby establishing Weyl-type character formulas and simplicity theorems that extend the first author's previous results.

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arXiv2025

Nesting behind $\hat{Z}$-invariants

In the spirit of arXiv:2501.12985, we propose an abelian categorification of $\hat{Z}$-invariants for negative definite plumbed 3-manifolds. It provides a blueprint for the expected dictionary between these $3$-manifolds and log VOAs; that is, the contribution from 3d $\mathcal{N}=2$ theory via 3d-3d correspondence is encoded as recursive and binary deviations from semisimplicity in the abelian category of modules over the hypothetical log VOA, and is decoded by the recursive application of the theory of Feigin--Tipunin construction. In particular, the nested Weyl-type character formulas provide virtual generalized characters reconstructing the $\hat{Z}$-invariants.

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arXiv2025

Hypercubic structures behind $\hat{Z}$-invariants

We propose an abelian categorification of $\hat{Z}$-invariants for Seifert $3$-manifolds. First, we give a recursive combinatorial derivation of these $\hat{Z}$-invariants using graphs with certain hypercubic structures. Next, we consider such graphs as annotated Loewy diagrams in an abelian category, allowing non-split extensions by the ambiguity of embedding of subobjects. If such an extension has good algebraic group actions, then the above derivation of $\hat{Z}$-invariants in the Grothendieck group of the abelian category can be understood in terms of the theory of shift systems, i.e., Weyl-type character formula of the nested Feigin-Tipunin constructions. For the project of developing the dictionary between logarithmic CFTs and 3-manifolds, these discussions give a glimpse of a hypothetical and prototypical, but unified construction/research method for the former from the new perspective, reductions of representation theories by recursive structures.

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arXiv2023

Quasi-lisse extension of affine $\mathfrak{sl}_2$ à la Feigin--Tipunin

We study the affine analogue $\mathrm{FT}_p(\mathfrak{sl}_2)$ of the triplet algebra. We show that $\mathrm{FT}_p(\mathfrak{sl}_2)$ is quasi-lisse and the associated variety is the nilpotent cone of $\mathfrak{sl}_2$. We realize $\mathrm{FT}_p(\mathfrak{sl}_2)$ as the global sections of a sheaf of vertex algebras in the spirit of Feigin--Tipunin and thereby construct infinitely many simple modules and, in particular solve a conjecture by Semikhatov and Tipunin. We introduce the Kazama--Suzuki dual superalgebra $s\mathcal{W}_p(\mathfrak{sl}_{2|1})$ of $\mathrm{FT}_p(\mathfrak{sl}_2)$ and their singlet type subalgebras $s\mathcal{M}_p(\mathfrak{sl}_{2|1})$ and $\mathcal{M}_p(\mathfrak{sl}_2)$ and show their correspondence of categories. For $p=1$, we show the logarithmic Kazhdan--Lusztig correspondence for these (super)algebras and, in particular, show that the quantum group corresponding to $s\mathcal{M}_1(\mathfrak{sl}_{2|1})$ is the unrolled restricted quantum supergroup $u^H_{-1}(\mathfrak{sl}_{2|1})$ as suggested by Semikhatov and Tipunin.

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arXiv2023

Torus links $T_{2s,2t}$ and $(s,t)$-log VOA

We reveal an intimate connection between the torus link $T_{2s,2t}$ and the logarithmic $(s,t)$ VOA. We show that the singlet character of $(s,t)$-log VOA at the root of unity coincides with the Kashaev invariant and that it has a property of the quantum modularity. Also shown is that the tail of the $N$-colored Jones polynomial gives the character. Furthermore we propose a geometric method to compute the character.

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arXiv2022

Simplicity of higher rank triplet W-algebras

We show that the higher rank triplet W-algebra is simple when p is bigger than or equal to h-1. Furthermore, we show that the Feigin-Tipunin's module over the higher rank triplet W-algebra introduced in arXiv:1002.5047 is simple if the parameter is in the closure of the fundamental alcove, and give the decomposition as a direct sum of simple modules over the affine W-algebras at level p-h.

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arXiv2021

On the Feigin-Tipunin conjecture

We prove the Feigin-Tipunin conjecture on the geometric construction of the logarithmic W-algebras associated with a simply-laced simple Lie algebra and an integer p bigger than 2, and their modules.

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