Questions tagged [tilting]
Questions about tilting theory, including questions on tilting modules, tilting sheaves, tilting complexes, and tilting objects.
31
questions
12
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1
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got any tricks to build up t-structures on derived categories?
Are there any good tricks to construct a heart of a t-structure? (I'm thinking on the derived category of coherent sheaves of some variety)
I'll start with the only one I know. If $(T,F)$ is a ...
- 1,265
10
votes
1
answer
680
views
What's the relationship between spherical twist functors and tilting?
I've been reading about connections between Coxeter groups and preprojective algebras, and I keep running into two operations on the derived categories of preprojective algebras which seem very ...
- 453
8
votes
1
answer
310
views
What is the remaining difficulty in the proof of the Humphreys conjecture (on the support variety of tilting modules)?
Humphreys conjecture describes the support variety of tilting modules using the correspondence between two-sided cells and nilpotent orbits. But the support variety can also be given by Lusztig–Vogan ...
- 93
7
votes
1
answer
314
views
Number of tilting modules
Let $A=A_n$ be the algebra of upper triangular matrices over a field $K$ with $n$ simple modules.
It is a nice result that there are $C_{n+1}=1,2,5,14,...$ (Catalan numbers for $n \geq 1$) tilting $...
- 26.1k
7
votes
0
answers
270
views
Not isomorphic varieties with isomorphic tilting algebras
Let $X$ be a smooth projective variety over a field, than tilting object $T$ on $X$ is a perfect complex that is a compact generator of the derived category $\operatorname{D}(QCoh(X))$ and satisfies ...
- 1,535
6
votes
1
answer
758
views
Socle of tilting modules in the BGG category $\mathcal{O}$ over a semisimple Lie algebra
Suppose that $\mathfrak{g}$ is a finite dimensional, complex, semisimple Lie algebra. Let $\mathcal{O}$ be the BGG category over $\mathfrak{g}$.
Tilting module theory play an important role in the ...
- 159
6
votes
1
answer
515
views
An equivalence of derived categories by Happel-Reiten-Smalø
I have a problem in understanding the proof of a theorem by Happel-Reiten-Smalø. The original reference is this article
http://arxiv.org/abs/0911.4473
.
I write down the text of the theorem and a ...
- 61
5
votes
2
answers
690
views
Examples of tilting objects that don't come from exceptional sequences
This is a question on geometric tilting theory. On smooth projective variety it is possible to define in general tilting object as perfect complex that satisfy some properties, but are there examples ...
- 1,535
5
votes
1
answer
207
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On tilting and cotilting modules
Let A be an Artin algebra and assume all modules are basic, then a classical result says that tilting modules $T$ are in bijection with complete cotorsion pairs $(T^{\perp}, \check{ add(T)})$ (with ...
- 26.1k
4
votes
1
answer
666
views
Graded quivers vs "ordinary" quivers and derived categories
I have heard the "slogan" that graded quivers are (derived) equivalent to ordinary quivers (with this "result" being attributed to Keller) and am looking for a precise statement and a reference.
By a ...
- 1,181
4
votes
1
answer
381
views
Tilting modules in positive characteristic
Consider the category of finite-dimensional representations for the algebraic group $\mathrm{SL}(n)$ in characteristic $p$. I know very little about this but am told there is a highest weight category ...
- 297
4
votes
2
answers
367
views
Torsion pairs and projective dimension
Let $A$ denote an algebra finite dimensional, basic, and connected algebra over a algebraically closed field $K$. We denote by $mod A$ the abelian category whose objects are finitely generated right ...
- 237
4
votes
0
answers
323
views
2-periodic derived equivalence
Let $A$ and $B$ be finite-dimensional algebras with finite global dimension over some field (in fact I am thinking of rational incidence algebras of finite posets).
Suppose we know that $A$ and $B$ ...
- 3,144
4
votes
0
answers
536
views
Geometric picture behind tilting sheaves
I am trying to read "Tilting exercises" and have trouble to see any geometric pictures behind the formulas.
So my questions are, how to think about tilting perverse sheaves?
Are they just formal ...
- 12.9k
3
votes
1
answer
500
views
Equivalence of definitions of Tilting
There seem to be two types of definitions for what is a tilting module (as a reference, Handbook of Tilting Theory). I believe that the original definition of Ringel is
Def: T, a module over a ...
- 31
3
votes
1
answer
298
views
Perverse tilting sheaves
In the article titled Tilting Exercises (See http://arXiv.org/abs/math/0301098v3) the authors define a notion of tilting perverse sheaves on an algebraic vareity $X$ with respect to stratification $\...
- 411
3
votes
1
answer
211
views
A canonical algebra of type $(2,2,r)$ is derived equivalent to a path algebra of type $\tilde{D}_{r+2}$ (references)
According to several articles I could find, a canonical algebra of type $(2,2,r)$ is derived equivalent to a path algebra of type $\tilde{D}_{r+2}$, where $r \geq 2$.
I don't know how to obtain this ...
- 237
3
votes
1
answer
323
views
Inverse of a tilting module
Let $k$ be a field, $A$ an associative unital $k$-algebra, $\operatorname{\mathsf{Mod}} A$ the
category of left $A$-modules and $D^b(\operatorname{\mathsf{Mod}} A)$ the bounded derived category. Let
$...
- 43
3
votes
1
answer
1k
views
Tensor product of sheaves and modules
Hello to all,
I have been looking quite recently at the following theorem:
Let $X$ be a projective variety and $T$ a tilting object for $X$. If $A:=End(T)$ is the associated endomorphism algebra, ...
3
votes
1
answer
156
views
On the definition and an example of silting/tilting subcategories in a triangulated categories according to a paper by Aihara and Iyama
In the paper "Silting mutation in triangulated categories" by Aihara and Iyama, I stumbled upon this nice definition( Definition 2.1) of a tilting/silting subcategory of a triangulated ...
- 83
3
votes
0
answers
329
views
Global dimension of endomorphism algebra of a coherent sheaf
Let $X$ be a smooth projective variety over algebraically closed field of characteristic zero. In one of the versions of definition of tilting object $\mathcal{F}$ on $X$ there is a requirement that ...
- 1,535
2
votes
2
answers
202
views
Which class of finite dimension algebra has only trivial tilting modules?
I have already knowed that selfinjective algebras have only trivial tilting modules,but besides this,is there any more?
- 21
2
votes
1
answer
180
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References on tilting distributions
I would be interested in any book, paper, or other reading material that gives a comprehensive treatment of tilted distributions using the following notion of "tilting" (or equivalent):
...
- 147
2
votes
1
answer
208
views
How to get $Hom_A(M,N) \cong Hom_{B^{op}}(Hom_A(N,T),Hom_A(M,T))$?
I am reading the paper"Dominant dimensions, derived quivalences and tilting modules", the link is here:http://link.springer.com/article/10.1007/s11856-016-1327-4.
On page 22,Lemma 4.2 says that let M ...
- 775
2
votes
0
answers
105
views
A question about t-structures in derived category
Let R be a ring and $_{R}P$ be a projective module, my question is whether $P^{\perp_{>0}}:=\{X\in D(R)|Hom(P,X[i])=0, i>0\}$ is an aisle i.e. if $(P^{\perp_{>0}}, (P^{\perp_{>0}})^{\perp}...
- 169
2
votes
0
answers
199
views
Could Partial Tiltings be studied as Almost Complete Tiltings?
The first part of what follows is a brief recap of the definitions, setting and motivations for my questions. Experts can find the questions at the end.
Here $k$ denotes an algebraically closed field,...
- 483
1
vote
2
answers
720
views
tilting module
is any indecomposable projective-injective A-module a direct summand of tilting module
- 19
1
vote
1
answer
190
views
Generating $K^b(\mathrm{proj})$ as a triangulated category from a full subcategory
Let $K^b(\mathrm{proj}\, A)$ be the bounded homotopy category of chain complexes over $\mathrm{proj}\, A$. In Rickard's paper 'Derived categories and stable equivalence', he defines a tilting complex ...
- 482
1
vote
1
answer
216
views
Compact generator of $D(\mathbb{P}^1)$
I suppose that Beilinson's compact generator (and, in fact, tilting object) $\mathcal{O} \oplus \mathcal{O}(1)$ in $D(\mathbb{P}^1)$ is the most well known example. I have the following simple ...
- 1,535
1
vote
1
answer
206
views
The projective modules of an algebra and the tilting module?
Let A be an algebra. We denote by by A-proj the full subcategory of A-mod consisting of projective modules. An A-module T is called a tilting module if $proj.dim(_{A}T)=n < \infty$, $Ext_{A} ^{j} (...
- 775
0
votes
0
answers
173
views
For a pair of non-commutative ring $(R, S)$, is there a faithfully semidualizing $(R, S)$-bimodule?
Given a pair of non-commutative rings $(R, S)$, how to construct a faithfully semidualizing $(R, S)$-bimodule?
Henrik Holm and Diana White introduced the concept of faithfully semidualizing ...
- 189