Graded Morita theory over a G-graded G-acted algebra
Virgilius-Aurelian Minuta
针对有限群G，在G-分次G-作用代数上建立了群分次Morita理论。
我们在G-分次G-作用代数上发展了群分次Morita理论，其中G是有限群。
We develop a group graded Morita theory over a G-graded G-acted algebra, where G is a finite group.
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Group graded Morita equivalences for wreath products
本文从群分次Morita等价出发，构造了张量积与圈积的Morita等价，推广了相关理论。
This note uses a variation of graded Morita theory for finite dimensional superalgebras to determine explicitly the graded basic superalgebras for all real and complex Clifford superalgebras. As an application, the Grothendieck groups of the category of left $\mathbb{Z}_2$-graded modules over all real and complex Clifford superalgebras are described explicitly.
Group graded endomorphism algebras and Morita equivalences
本文证明了特征三元组蝴蝶定理的群分次Morita等价版本，从而提供了一种从相关等价构造块扩张等价的新方法。
We study the structural and homological properties of graded Artinian modules over generalized Weyl algebras (GWAs), and this leads to a decomposition result for the category of graded Artinian modules. Then we define and examine a category of graded modules analogous to the BGG category O. We discover a condition on the data defining the GWA that ensures O has a system of projective generators. Under this condition, O has nice representation-theoretic properties. There is also a decomposition result for O. Next, we give a necessary condition for there to be a strongly graded Morita equivalenc…
We introduce group graded basic Morita equivalences between algebras deter- mined by blocks of normal subgroups, and by using the extended Brauer quotient, we show that they induce graded basic Morita equivalences at local levels.
This paper is investigative work into the properties of a family of graded algebras recently defined by Varagnolo and Vasserot, which we call VV algebras. We compare categories of modules over KLR algebras with categories of modules over VV algebras, establishing various Morita equivalences. Using these Morita equivalences we are able to prove several properties of certain classes of VV algebras such as (graded) affine cellularity and affine quasi-heredity.
$H$-Equivariant Morita equivalences of Loewy-graded comodule algebras
本文证明Loewy分次余模代数在零次部分满足H0-等变Morita等价时，可提升为H-等变Morita等价，并推广到余理想子代数情形，最后讨论Kac-Paljutkin Hopf代数特例。
Cohen-Montgomery duality for bimodules and singular equivalences of Morita type
本文研究了双模和Morita类型的奇异等价的Cohen-Montgomery对偶性，展示了轨道双模与 smash 乘积双模互为逆运算，应用于Morita等价及各类等价转换。
In this paper, we present a method to construct new stable equivalences of Morita type. Suppose that a stable equivalence of Morita type between finite dimensional algebras $A$ and $B$ is defined by a $B$-$A$-bimodule $N$. Then, for any finite admissible set $Φ$ of natural numbers and any generator $X$ of the $A$-module category, the $Φ$-Beilinson-Green algebras $\scr G^Φ_A(X)$ and $\scr G^Φ_B(N\otimes_AX)$ are stably equivalent of Morita type. In particular, if $Φ=\{0\}$, we get a known result in literature. As another consequence, we construct an infinite family of derived equivalent algebra…
Character triples and equivalences over a group graded G-algebra
该研究提出群分次G-代数上块扩张间的Morita与Rickard等价，证明其可推出对应特征标三元组满足Späth中心序关系，丰富了群表示论的等价理论。
In this paper we investigate gradings on tame blocks of group algebras whose defect group is dihedral. We classify gradings on an arbitrary dihedral block up to graded Morita equivalence. We do this by computing the group of outer automorphisms that fix the isomorphism classes of simple modules. We also show how to grade these blocks via transfer of gradings via dervied equivalences.
Morita equivalences between cyclotomic KLR algebras in types $\mathtt{C}_\infty$ and $\mathtt{A}_\infty$
通过建立类型C∞一级与A∞二级分圆KLR代数的分级Morita等价，推导出所有类型C∞一级分圆KLR代数的分级分解数和完整子模结构。
Morita theory of finite representations of Leavitt path algebras
本文证明对于无汇点和源点的有限图，Leavitt 路径代数的分级 Grothendieck 群作为保序模同构可推出其局部有限维分级模范畴及有限维模范畴等价，从而为分级分类猜想提供有限表示层面的 Morita 理论支持。
We introduce and study the notion of pseudo-Frobenius graded algebra with enough idempotents, showing that it follows the pattern of the classical concept of pseudo-Frobenius (PF) and Quasi-Frobenius (QF) rings, in particular finite dimensional self-injective algebras, as studied by Nakayama, Morita, Faith, Tachikawa, etc. We show that such an algebra is characterized by the existence of a graded Nakayama form. Moreover, we prove that the pseudo-Frobenius property is preserved and reflected by covering functors, a fact that makes the concept useful in Representation Theory.
Let $(\mathcal{K},\mathcal{O},k)$ be a $p$-modular system with $k$ algebraically closed, let $b$ be a block of the normal subgroup $H$ of $G$ having defect pointed group $Q_δ$ in $H$ and $P_γ$ in $G$, and consider the block extension $b\mathcal{O}G$. One may attach to $b$ an extended local category $\mathcal{E}_{(b,H,G)}$, a group extension $L$ of $Z(Q)$ by $N_G(Q_δ)/C_H(Q)$ having $P$ as a Sylow $p$-subgroup, and a cohomology class $[α]\in H^2(N_G(Q_δ)/QC_H(Q),k^\times)$. We prove that these objects are invariant under the $G/H$-graded basic Morita equivalences. Along the way, we give alterna…
Two-sided tilting complexes over symmetric algebras sending simple modules to shifts of modules
本文针对代数闭域上有限维对称代数的倾斜复形，其不同分次分量无公共不可分解投射直和项，从诱导Morita型稳定等价的双模出发，显式地（重新）构造了对应于该倾斜复形的双侧倾斜复形。
We show that the Brauer algebra over the complex numbers for an integral parameter delta can be equipped with a grading, in the case of delta being non-zero turning it into a graded quasi-hereditary algebra. In which case it is Morita equivalent to a Koszul algebra. This is done by realizing the Brauer algebra as an idempotent truncation of a certain level two VW-algebra for some large positive integral parameter N. The parameter delta appears then in the choice of a cyclotomic quotient. This cyclotomic VW-algebra arises naturally as an endomorphism algebra of a certain projective module in pa…
Morita equivalences for Zhu's algebra
本文通过引入新理想并借助模式转移代数，证明朱氏代数不仅包含顶点算子代数分次模的零次信息，还包含高次分量信息，并由此给出有理性的等价条件及高层朱氏代数的显式呈现。
A classification of derived-discrete graded algebras
将Vossieck的导出离散代数分类推广到局部有限非正分次代数，证明其等价于分次Morita等价于Dynkin型的片断遗传代数或分次温和单圈代数（不满足分次时钟条件），并证明分次时钟条件在导出等价下不变。
In this paper we construct non-negative gradings on a basic Brauer tree algebra $A_Γ$ corresponding to an arbitrary Brauer tree $Γ$ of type $(m,e)$. We do this by transferring gradings via derived equivalence from a basic Brauer tree algebra $A_S$, whose tree is a star with the exceptional vertex in the middle, to $A_Γ$. The grading on $A_S$ comes from the tight grading given by the radical filtration. To transfer gradings via derived equivalence we use tilting complexes constructed by taking Green's walk around $Γ$ (cf. [\ref{Zak}]). By computing endomorphism rings of these tilting complexes …
In this paper we study the existence of gradings on finite dimensional associative algebras. We prove that a connected algebra $A$ does not have a non-trivial grading if and only if $A$ is basic, its quiver has one vertex, and its group of outer automorphisms is unipotent. We apply this result to prove that up to graded Morita equivalence there do not exist non-trivial gradings on the blocks of group algebras with quaternion defect groups and one isomorphism class of simple modules.
We consider RoCK (or Rouquier) blocks of symmetric groups and Hecke algebras at roots of unity. We prove a conjecture of Turner asserting that a certain idempotent truncation of a RoCK block of weight $d$ of a symmetric group $\mathfrak S_n$ defined over a field $F$ of characteristic $e$ is Morita equivalent to the principal block of the wreath product $\mathfrak S_e \wr \mathfrak S_d$. This generalises a theorem of Chuang and Kessar that applies to RoCK blocks with abelian defect groups. Our proof relies crucially on an isomorphism between $F\mathfrak S_n$ and a cyclotomic Khovanov-Lauda-Rouq…
We introduce some graded versions of the walled Brauer algebra, working over a field of characteristic zero. This allows us to prove that the walled Brauer algebra is Morita equivalent to an idempotent truncation of a certain infinite dimensional version of Khovanov's arc algebra, as suggested by recent work of Cox and De Visscher. We deduce that the walled Brauer algebra is Koszul whenever its defining parameter is non-zero.
The effectiveness of the aplication of constructions in $G$-graded $k$-categories to the computation of the fundamental group of a finite dimensional $k$-algebra, alongside with open problems still left untouched by those methods and new problems arisen from the introduction of the concept of fundamental group of a $k$-linear category, motivated the investigation of $H$-module categories, i.e., actions of a Hopf algebra $H$ on a $k$-linear category. The $G$-graded case corresponds then to actions of the Hopf algebra $k^G$ on a $k$-linear category. In this work we take a step further and introd…
In this paper we prove an analogue of a recent result of Gordon and Stafford that relates the representation theory of certain noncommutative deformations of the coordinate ring of the n-th symmetric power of C^2 with the geometry of the Hilbert scheme of n points in C^2 through the formalism of Z-algebras. Our work produces, for every regular noncommutative deformation O^λof a Kleinian singularity X=C^2/Γ, as defined by Crawley-Boevey and Holland, a filtered Z-algebra which is Morita equivalent to O^λ, such that the associated graded Z-algebra is Morita equivalent to the minimal resolution of…
We show that, up to Morita equivalence, any finite-dimensional algebra with a suitable homological system, admits an exact Borel subalgebra. This generalizes a theorem by Koenig, Külshammer and Ovsienko, which holds for quasi-hereditary algebras. Our proof follows the same general scheme proposed by these authors, in a more general context: we associate a differential graded tensor algebra with relations, using the structure of $A_{\infty}-$algebra of a suitable Yoneda algebra, and use its category of modules to describe the category of filtered modules associated to the given homological syst…
AS-regularity of geometric algebras of plane cubic curves
本文分类了三维二次AS-正则代数的超势，给出Type EC的AS-正则判据，并证明任意此类代数与某Calabi-Yau AS-正则代数分次Morita等价，从而简化非交换射影概形的研究。
Triangle equivalences between Gorenstein tiled orders and incidence algebras of posets
本文研究了Gorenstein铺砌阶环与有限偏序集的incidence算代数之间的三角等价关系，并探讨了相关偏序集在分级Morita等价和覆盖下的行为，最后对满足特定条件的Gorenstein铺砌阶环进行了分类。
It is shown that, the quasi-Koszulities of algebras and modules are Morita invariance. A finite-dimensional $K$-algebra $A$ with an action of $G$ is quasi-Koszul if and only if so is the skew group algebra $A \ast G$, where $G$ is a finite group satisfying $\char K \nmid |G|$. A finite-dimensional $G$-graded $K$-algebra $A$ is quasi-Koszul if and only if so is the smash product $A # G^*$, where $G$ is a finite group satisfying $\char K \nmid |G|$. These results are applied to prove that, if a finite-dimensional connected quiver algebra is Koszul then so are its Galois covering algebras with fi…
Modules and operator rings of Reynolds algebras
本文构造结合环发展加权雷诺兹代数的模理论，明确其模范畴等价性、自由模与算子环性质，将相关代数理论转移至雷诺兹模，通过域上计算给出不同算子对应的算子环整体维数。
This paper has two parts. The main goal, carried out in Part I, is to survey some recent work by the authors in which "forced" grading constructions have played a significant role in the representation theory of semisimple algebraic groups $G$ in positive characteristic. The constructions begin with natural finite dimensional quotients of the distribution algebras Dist$(G)$, but then "force" gradings into the picture by passing to positively graded algebras constructed from ideal filtrations of these quotients. This process first guaranteed a place for itself by proving, for large primes, that…
In this paper the authors investigate the $q$-Schur algebras of type B that were constructed earlier using coideal subalgebras for the quantum group of type A. The authors present a coordinate algebra type construction that allows us to realize these $q$-Schur algebras as the duals of the $d$th graded components of certain graded coalgebras. Under suitable conditions an isomorphism theorem is proved that demonstrates that the representation theory reduces to the $q$-Schur algebra of type A. This enables the authors to address the questions of cellularity, quasi-hereditariness and representatio…
Following the approach of Haiden-Katzarkov-Kontsevich arXiv:1409.8611, to any homologically smooth graded gentle algebra $A$ we associate a triple $(Σ_A, Λ_A; η_A)$, where $Σ_A$ is an oriented smooth surface with non-empty boundary, $Λ_A$ is a set of stops on $\partial Σ_A$ and $η_A$ is a line field on $Σ_A$, such that the derived category of perfect dg-modules of $A$ is equivalent to the partially wrapped Fukaya category of $(Σ_A, Λ_A ;η_A)$. Modifying arguments of Johnson and Kawazumi, we classify the orbit decomposition of the action of the (symplectic) mapping class group of $Σ_A$ on the h…
Endomorphism algebras and Hecke algebras for reductive p-adic groups
本文通过分析生成元的自同态代数，证明既约 p-adic 群的 Bernstein 块与扭曲仿射 Hecke 代数几乎等价，并据此对不可约表示进行分类，证明了 ABPS 猜想。
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