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We extend the definition of the Saito reflection functor of the Khovanov- Lauda-Rouquier algebras to symmetric Kac-Moody algebra case and prove that it defines a monoidal functor.

Quantum Algebra · Mathematics 2018-09-05 Syu Kato

We construct reflection functors for quiver Hecke algebras associated with arbitrary symmetrizable Kac-Moody algebras, from a higher representation-theoretic viewpoint. These functors provide a categorification of Lusztig's braid group…

Representation Theory · Mathematics 2025-12-23 Haruto Murata

We construct the reflection functors for quiver Hecke algebras of an arbitrary symmetrizable Kac-Moody type. These reflection functors categorify Lusztig's braid symmetries.

Representation Theory · Mathematics 2025-11-11 Masaki Kashiwara , Myungho Kim , Se-jin Oh , Euiyong Park

This article represents a preliminary attempt to link Kan extensions, and some of their further developments, to Fourier theory and quantum algebra through *-autonomous monoidal categories and related structures.

Quantum Algebra · Mathematics 2007-05-23 Brian J. Day

In this paper we establish affinizations and R-matrices in the language of pro-objects, and as an application, we construct reflection functors over the localizations of quiver Hecke algebras of arbitrary finite types. This reflection…

Representation Theory · Mathematics 2025-05-02 Masaki Kashiwara , Myungho Kim , Se-jin Oh , Euiyong Park

Mirror symmetry predicts an action by the fundamental group of a conjectural stringy K\"ahler moduli space on the derived category of an algebraic variety. For a toric variety, a model for this space is understood, but constructing the…

Symplectic Geometry · Mathematics 2026-05-01 Michela Barbieri , Andrew Hanlon , Jeff Hicks

We construct a categorification of the braid groups associated with Coxeter groups inside the homotopy category of Soergel's bimodules. Classical actions of braid groups on triangulated categories should come from an action of this monoidal…

Representation Theory · Mathematics 2007-05-23 Raphael Rouquier

Let $\mathfrak{g}_0$ be a simple Lie algebra of type ADE and let $U'_q(\mathfrak{g})$ be the corresponding untwisted quantum affine algebra. We show that there exists an action of the braid group $B(\mathfrak{g}_0)$ on the quantum…

Representation Theory · Mathematics 2020-04-13 Masaki Kashiwara , Myungho Kim , Se-jin Oh , Euiyong Park

Let K be a commutative ring. In this article we construct a symmetric monoidal Quillen model structure on the category of small K-categories which enhances classical Morita theory. We then use it in order to obtain a natural tensor…

Category Theory · Mathematics 2019-10-09 Ivo Dell'Ambrogio , Gonçalo Tabuada

We show that the complete bornological convolution algebras of Lie groupoids and convolution bimodules of groupoid bibundles define a monoidal functor from the 2-category of differentiable stacks to the Morita 2-category of complete…

Differential Geometry · Mathematics 2026-05-29 David Aretz , Christian Blohmann

Recently the authors initiated an $\imath$Hall algebra approach to (universal) $\imath$quantum groups arising from quantum symmetric pairs. In this paper we construct and study BGP type reflection functors which lead to isomorphisms of the…

Representation Theory · Mathematics 2021-05-26 Ming Lu , Weiqiang Wang

Given a domain of characteristic zero $R$, we functorially construct a rigid symmetric monoidal stable $\infty$-category whose $K_0$ is $R$, solving a problem of Khovanov. We also functorially construct for any reduced commutative ring $R$…

K-Theory and Homology · Mathematics 2024-12-20 Ishan Levy

Associated to a simple root of a finite-dimensional complex semisimple Lie algebra, there are several endofunctors (defined by Arkhipov, Enright, Frenkel, Irving, Jantzen, Joseph, Mathieu, Vogan and Zuckerman) on the BGG category…

Representation Theory · Mathematics 2007-05-23 Volodymyr Mazorchuk , Catharina Stroppel

We define 2-functors on the categorified quantum group of a simply-laced Kac-Moody algebra that induce Lusztig's internal braid group action at the level of the Grothendieck group.

Quantum Algebra · Mathematics 2024-04-17 Michael T. Abram , Laffite Lamberto-Egan , Aaron D. Lauda , David E. V. Rose

We show that two constructions yield equivalent braided monoidal categories. The first is topological, based on Legendrian tangles and skein relations, while the second is algebraic, in terms of chain complexes with complete flag and…

Quantum Algebra · Mathematics 2022-11-08 Fabian Haiden

We first construct an action of the extended double affine braid group $\mathcal{\ddot{B}}$ on the quantum toroidal algebra $U_{q}(\mathfrak{g}_{\mathrm{tor}})$ in untwisted and twisted types. As a crucial step in the proof, we obtain a…

Quantum Algebra · Mathematics 2024-03-18 Duncan Laurie

We establish automorphisms with closed formulas on quasi-split $\imath$quantum groups of symmetric Kac-Moody type associated to restricted Weyl groups. The proofs are carried out in the framework of $\imath$Hall algebras and reflection…

Quantum Algebra · Mathematics 2022-11-23 Ming Lu , Weiqiang Wang

We introduce a monoidal analogue of Jantzen filtrations in the framework of monoidal abelian categories with generic braidings. It leads to a deformation of the multiplication of the Grothendieck ring. We conjecture, and we prove in many…

Representation Theory · Mathematics 2026-04-07 Ryo Fujita , David Hernandez

In this paper, we state and prove precise theorems on the classification of the category of (braided) categorical groups and their (braided) monoidal functors, and some applications obtained from the basic studies on monoidal functors…

Category Theory · Mathematics 2013-01-04 Nguyen Tien Quang , Nguyen Thu Thuy , Pham Thi Cuc

It is well known that braided monoidal categories are the categorical algebras of the little two-dimensional disks operad. We introduce involutive little disks operads, which are Z/2Z-orbifold versions of the little disks operads. We…

Quantum Algebra · Mathematics 2018-04-09 T. A. N. Weelinck
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