Yanfeng Chen
We build extensions of the arc rings, relate their centers to the cohomology rings of the Springer varieties, and categorify all level two representations of quantum sl(N).
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We develop a diagrammatic categorification of the polynomial ring $Z[x]$. Our categorification satisfies a version of Bernstein-Gelfand-Gelfand reciprocity property with the indecomposable projective modules corresponding to $x^n$ and standard modules to $(x-1)^n$ in the Grothendieck ring.
Let $n$ be a product of two distinct prime numbers. We construct a triangulated monoidal category having a Grothendieck ring isomorphic to the ring of $n$:th cyclotomic integers.
On a necessary condition for unitary categorification of fusion rings
本文针对 Liu、Palcoux 与 Wu 提出的融合环酉范畴化正不变量必要条件，给出更直接的证明，并讨论这些不变量的整数性质。
Noncommutative Minkowski integral inequality and a unitary categorification criterion for fusion rings
本文证明了非交换闵可夫斯基积分不等式，并给出了融合环的单位ary分类化准则。
A categorification of cyclotomic rings
本研究针对分圆环的范畴化问题，构造了Grothendieck环同构于分圆整数环$\mathbb{O}_n$的三角幺半范畴，为分圆环提供了范畴化实现。
The integral group rings $\mathbb{Z}G$ for finite groups $G$ are precisely those fusion rings whose basis elements have Frobenius-Perron dimension 1, and each is categorifiable in the sense that it arises as the Grothendieck ring of a fusion category. Here we analyze the structure and representation theory of fusion rings with a basis of elements whose Frobenius-Perron dimensions take exactly one value distinct from 1. Our goal is a set of results which assist in characterizing when such fusion rings are categorifiable. As proof of concept, we completely classify the categorifiable near-group …
We construct an explicit categorification of the action of tangles on tensor powers of the fundamental representation of quantum sl(2).
This is a survey paper of the theory of crystal bases, global bases and the cluster algebra structure on the quantum coordinate rings.
We develop a diagrammatic categorification of the polynomial ring Z[x], based on a geometrically defined graded algebra. This construction generalizes to categorification of some special functions, such as Chebyshev polynomials. Diagrammatic algebras featured in these categorifications lead to the first topological interpretations of the Bernstein-Gelfand-Gelfand reciprocity property.
A diagrammatic approach to categorification of quantum groups I
本文提出一种图解方法，为无环无重边图构造环族，其投射模范畴实现量子群负部分的范畴化。
We describe a collection of differential graded rings that categorify weight spaces of the positive half of the quantized universal enveloping algebra of the Lie superalgebra gl(m|1).
A categorification of the integral form of the Cartan subalgebra for quantum sl(2)
该研究通过有限维射影空间上的等变凝聚层范畴的余极限，提出量子sl(2)的Lusztig积分形式的范畴化，其非等变版本可给出整值多项式环的非半单阿贝尔范畴化。
This paper classifies the Grothendieck rings of complex fusion categories of multiplicity one up to rank six. Among 72 possible fusion rings, $25$ ones are filtered out by using categorification criteria. Each of the remaining 47 fusion rings admits a unitary complex categorification. We found 6 new Grothendieck rings, categorified by applying a localization approach of the Pentagon Equation.
In this paper, we investigate quantum Fourier analysis on subfactors and unitary fusion categories. We prove the complete positivity of the comultiplication for subfactors and derive a primary $n$-criterion of unitary categorifcation of multifusion rings. It is stronger than the Schur product criterion when $n\geq3$. The primary criterion could be transformed into various criteria which are easier to check in practice even for noncommutative, high-rank, high-multiplicity, multifusion rings. More importantly, the primary criterion could be localized on a sparse set, so that it works for multifu…
The purpose of this paper is to study categorifications of tensor products of finite dimensional modules for the quantum group for sl(2). The main categorification is obtained using certain Harish-Chandra bimodules for the complex Lie algebra gl(n). For the special case of simple modules we naturally deduce a categorification via modules over the cohomology ring of certain flag varieties. Further geometric categorifications and the relation to Steinberg varieties are discussed. We also give a categorical version of the quantised Schur-Weyl duality and an interpretation of the (dual) canonical …
This thesis splits into two major parts. The connection between the two parts is the notion of "categorification" which we shortly explain/recall in the introduction. In the first part of this thesis we extend Bar-Natan's cobordism based categorification of the Jones polynomial to virtual links. Our topological complex allows a direct extension of the classical Khovanov complex (h=t=0), the variant of Lee (h=0,t=1) and other classical link homologies. We show that our construction allows, over rings of characteristic 2, extensions with no classical analogon, e.g. Bar-Natan's Z/2Z-link homology…
We associate a diagrammatic monoidal category $\mathcal{H}\textit{eis}_k(A;z,t)$, which we call the quantum Frobenius Heisenberg category, to a symmetric Frobenius superalgebra $A$, a central charge $k \in \mathbb{Z}$, and invertible parameters $z,t$ in some ground ring. When $A$ is trivial, i.e. it equals the ground ring, these categories recover the quantum Heisenberg categories introduced in our previous work, and when the central charge $k$ is zero they yield generalizations of the affine HOMFLY-PT skein category. By exploiting some natural categorical actions of $\mathcal{H}\textit{eis}_k…
Solution of a Problem in Monoidal Categorification by Additive Categorification
本文利用Palu广义变异规则和整体维数至多2的代数相关簇范畴，为Kashiwara-Kim-Oh-Park构造的单项范畴化种子提供了显式箭图，从而解决了量子群表示论与箭图表示论之间的一个簇组合学问题。
We categorify a coideal subalgebra of the quantum group of $\mathfrak{sl}_{2r+1}$ by introducing a $2$-category à la Khovanov-Lauda-Rouquier, and show that self-dual indecomposable $1$-morphisms categorify the canonical basis of this algebra. This allows us to define a categorical action of this coideal algebra on the categories of modules over cohomology rings of partial flag varieties and on the BGG category $\mathcal{O}$ of type B/C.
Module Monoidal Categories as Categorification of Associative Algebras
本文引入非单位模幺半范畴的概念以范畴化结合代数的刻画，并证明在有单位情况下该定义与先前模张量范畴定义的2-范畴等价性。
We categorify Lusztig's version of the quantized enveloping algebra for sl(2). Using a graphical calculus a 2-category is constructed whose split Grothendieck ring is isomorphic to Lusztig's algebra. The indecomposable morphisms of this 2-category lift Lusztig's canonical basis, and the Homs between 1-morphisms are graded lifts of a semilinear form defined on quantum sl(2). Graded lifts of various homomorphisms and antihomomorphisms of Lusztig's algebra arise naturally in the context of our graphical calculus. Using iterated flag varieties, a representation of the 2-category is constructed for…
Real simple modules over simply-laced quantum affine algebras and categorifications of cluster algebras
本文引入简单连通量子仿射代数模范畴的子范畴，证明其量子Grothendieck环具有量子簇代数结构，并据此分类了实单模，提出了相关猜想。
Monoidal categorification of generalized cluster algebras and conjectures of Fraser and Gleitz
本文定义了广义簇代数的幺半范畴化概念，并证明了对于k=3和任意ℓ≥2，限制量子环代数模块范畴的子范畴的Grothendieck环同构于秩为2ℓ-2的广义簇代数，从而证明了Gleitz猜想的第一部分。
Monoidal Categorification and Quantization of Braid Varieties
针对单链型单连通代数群的正辫子字，本文构造辫子簇量子簇代数的幺范畴化，将其与局域化量子环等同，验证特殊化同态恢复原簇代数，还建立了双弦簇变量的量子网格子式与广义量子T-系统。
Isomorphisms among quantum Grothendieck rings and cluster algebras
该研究为量子loop代数表示的量子Grothendieck环同构建立cluster理论诠释，得到monoidal范畴化定理的量子化，解决非simply-laced量子loop代数相关长期问题并建立量子$T$-系统，还给出同构对应的显式双有理变换替换公式。
The sequence of rings $H^n, n\ge 0,$ introduced in math.QA/0103190, controls categorification of the quantum sl(2) invariant of tangles. We prove that the center of $H^n$ is isomorphic to the cohomology ring of the (n,n) Springer variety and show that the braid group action in the derived category of $H^n$-modules descends to the Springer action of the symmetric group.
Inflations among quantum Grothendieck rings of type A
该研究引入A型量子loop代数有限维模的量子Grothendieck环间的单同态，证明其保持单$(q,t)$-特征的典范基，验证了Brito-Chari的猜想，并讨论了相关范畴化问题。
This expository article explains how planar diagrammatics naturally arise in the study of categorified quantum groups with a focus on the categorification of quantum sl2. We derive the definition of categorified quantum sl2 and highlight some of the new structure that arises in categorified quantum groups. The expert will find a discussion of rescalling isomorphisms for categorified quantum sl2, a proof that cyclotomic quotients of the nilHecke algebra are isomorphic to matrix rings over the cohomology ring of Grassmannians, and an interpretation of `fake bubbles' using symmetric functions.
We construct the quantized enveloping algebra of any simple Lie algebra of type ADE as the quotient of a Grothendieck ring arising from certain cyclic quiver varieties. In particular, the dual canonical basis of a one-half quantum group with respect to Lusztig's bilinear form is contained in the natural basis of the Grothendieck ring up to rescaling. This paper expands the categorification established by Hernandez and Leclerc to the whole quantum groups. It can be viewed as a geometric counterpart of Bridgeland's recent work for type ADE.
Indecomposable objects in Khovanov-Sazdanovic's generalizations of Deligne's interpolation categories
该研究针对Khovanov-Sazdanovic提出的Deligne插值范畴的推广形式，通过引入带滤过Krull-Schmidt范畴的相伴分次范畴等工具，完成了不可分解对象的分类并确定了相伴分次Grothendieck环。
A categorification of the Beilinson-Lusztig-MacPherson form of the quantum sl(2) was constructed in the paper arXiv:0803.3652 by the second author. Here we enhance the graphical calculus introduced and developed in that paper to include two-morphisms between divided powers one-morphisms and their compositions. We obtain explicit diagrammatical formulas for the decomposition of products of divided powers one-morphisms as direct sums of indecomposable one-morphisms; the latter are in a bijection with the Lusztig canonical basis elements. These formulas have integral coefficients and imply that o…
We study the representation theory of the smallest quantum group and its categorification. The first part of the paper contains an easy visualization of the 3j-symbols in terms of weighted signed line arrangements in a fixed triangle and new binomial expressions for the 3j-symbols. All these formulas are realized as graded Euler characteristics. The 3j-symbols appear as new generalizations of Kazhdan-Lusztig polynomials. A crucial result of the paper is that complete intersection rings can be employed to obtain rational Euler characteristics, hence to categorify rational quantum numbers. This …
Braid group action on quantum virtual Grothendieck ring through constructing presentations
本文通过构造量子虚拟格罗滕迪克环的展示，证明其可视为幂幺量子坐标代数的玻色子扩张，并利用Dynkin箭图反射诱导的自同构建立了辫子群作用。
The characters of the (total) Springer representations are identified with the Green functions by Kazhdan [Israel J. Math. {\bf 28} (1977)], and the latter are identified with Hall-Littlewood's $Q$-functions by Green [Trans. Amer. Math. Soc. (1955)]. In this paper, we present a purely algebraic proof that the (total) Springer representations of $\mathop{GL} ( n )$ are $\mathrm{Ext}$-orthogonal to each other, and show that it is compatible with the natural categorification of the ring of symmetric functions.
Weyl group symmetry of q-characters
本文定义 Weyl 群在 q-特征标同态余域完备化上的作用，证明其不变元恰为 q-特征标环，并阐明屏蔽算子与简单反射的关系。
In this master thesis we construct an oddification of the rings $H^n$ from arXiv:math/0103190 using the functor from arXiv:0710.4300 . This leads to a collection of non-associative rings $OH^n_C$ where $C$ represent some choices of signs. Extending the center up to anti-commutative elements, we get a ring $OZ(OH^n_C)$ which is isomorphic to the oddification of the ring cohomology of the $(n,n)$-Springer variety from arXiv:1203.0797 .
Quantum cluster algebra, braid moves and quantum virtual Grothendieck ring
本文研究量子虚拟Grothendieck环与量子簇代数的关系，揭示了辫子移动对环结构的影响，并证明了截断Kirillov--Reshetikhin多项式和标准基元素的系数正性。
Our investigation in the present paper is based on three important results. (1) In [12], Ringel introduced Hall algebra for representations of a quiver over finite fields and proved the elements corresponding to simple representations satisfy the quantum Serre relation. This gives a realization of the nilpotent part of quantum group if the quiver is of finite type. (2) In [4], Green found a homological formula for the representation category of the quiver and equipped Ringel's Hall algebra with a comultiplication. The generic form of the composition subalgebra of Hall algebra generated by simp…
Let $\mathcal{R}$ be the Grothendieck ring of complex smooth finite-length representations of the sequence of p-adic groups $\{GL_n(F)\}_{n=0}^\infty$, with multiplication defined through parabolic induction. We study the problem of the decomposition of products of irreducible representations in $\mathcal{R}$. We obtain a necessary condition on irreducible factors of a given product by introducing a width invariant. Width $1$ representations form the previously studied class of ladder representations. We later focus on the case of a product of two ladder representations, for which we establish…
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