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We consider derived categories of coherent sheaves on smooth projective varieties. We prove that any equivalence between them can be represented by an object on the product. Using this, we give a necessary and sufficient condition for…

alg-geom · Mathematics 2009-11-28 Dmitri Orlov

This note gives a generalization of spherical twists, and describe the autoequivalences associated to certain non-spherical objects. Typically these are obtained by deforming the structure sheaves of (0,-2)-curves on threefolds, or…

Algebraic Geometry · Mathematics 2007-05-23 Yukinobu Toda

In this article, a new construction of derived equivalences is given. It relates different endomorphism rings and more generally cohomological endomorphism rings - including higher extensions - of objects in triangulated categories. These…

Representation Theory · Mathematics 2011-02-15 Wei Hu , Steffen Koenig , Changchang Xi

We discuss derived categories of coherent sheaves on algebraic varieties. We focus on the case of non-singular Calabi-Yau varieties and consider two unsolved problems: proving that birational varieties have equivalent derived categories,…

Algebraic Geometry · Mathematics 2019-12-20 Tom Bridgeland

We study Dehn twists along Lagrangian submanifolds that are finite quotients of spheres. We decribe the induced auto-equivalences to the derived Fukaya category and explain its relation to twists along spherical functors.

Symplectic Geometry · Mathematics 2018-10-16 Cheuk Yu Mak , Weiwei Wu

We investigate the bounded derived category of coherent sheaves on irreducible singular projective curves of arithmetic genus one. A description of the group of exact auto-equivalences and the set of all t-structures of this category is…

Algebraic Geometry · Mathematics 2007-05-23 Igor Burban , Bernd Kreussler

Here we carefully construct an equivalence between the derived category of coherent sheaves on an elliptic curve and a version of the Fukaya category on its mirror. This is the most accessible case of homological mirror symmetry. We also…

Symplectic Geometry · Mathematics 2015-01-06 Andrew Port

We consider the structure of the derived categories of coherent sheaves on Fano threefolds with Picard number 1 and describe a strange relation between derived categories of different threefolds. In the Appendix we discuss how the ring of…

Algebraic Geometry · Mathematics 2008-09-02 Alexander Kuznetsov

We construct a twist-closed enhancement of the category ${\mathcal D}^b_{\rm coh}(X)$, the bounded derived category of complexes of ${\mathcal O}_X$-modules with coherent cohomology, by means of the DG-category of…

Algebraic Geometry · Mathematics 2022-11-22 Alexey Bondal , Alexei Rosly

The derived category of coherent sheaves on a general quintic threefold is a central object in mirror symmetry. We show that it can be embedded into the derived category of a certain Fano elevenfold. Our proof also generates related…

Algebraic Geometry · Mathematics 2015-11-18 Ed Segal , Richard P. Thomas

The B-side of Kontsevich's Homological Mirror Symmetry Conjecture is discussed. We give first a self-contained study of derived categories and their homological algebra, and later restrict to the bounded derived category of schemes and…

Algebraic Geometry · Mathematics 2023-06-28 Alessandro Imparato

We study triangulated categories which can be modeled by an oriented marked surface $\mathcal{S}$ and a line field $\eta$ on $\mathcal{S}$. This includes bounded derived categories of gentle algebras and -- conjecturally -- all partially…

Representation Theory · Mathematics 2019-04-11 Sebastian Opper

We consider autoequivalences of the bounded derived category of coherent sheaves on a K3 surface. We prove that the image of the autoequivalences has index at most two in the group of the Hodge isometries of the Mukai lattice. Motivated by…

Algebraic Geometry · Mathematics 2007-05-23 Shinobu Hosono , Bong H. Lian , Keiji Oguiso , Shing-Tung Yau

We study the derived categories of coherent sheaves of weighted projective spaces and their noncommutative deformations, and the derived categories of Lagrangian vanishing cycles of their mirror Landau-Ginzburg models. In particular, we…

Algebraic Geometry · Mathematics 2009-11-24 Denis Auroux , Ludmil Katzarkov , Dmitri Orlov

We present a construction of autoequivalences of derived categories of symmetric algebras based on projective modules with periodic endomorphism algebras. This construction generalises autoequivalences previously constructed by…

Representation Theory · Mathematics 2014-02-26 Joseph Grant

We prove that the bounded derived category of coherent sheaves with proper support is equivalent to the category of locally-finite, cohomological functors on the perfect derived category of a quasi-projective scheme over a field. We…

Algebraic Geometry · Mathematics 2011-05-18 Matthew Robert Ballard

Let $X$ denote the `conifold smoothing', the symplectic Weinstein manifold which is the complement of a smooth conic in $T^*S^3$, or equivalently the plumbing of two copies of $T^*S^3$ along a Hopf link. Let $Y$ denote the `conifold…

Symplectic Geometry · Mathematics 2026-04-15 Ailsa Keating , Ivan Smith

We study homological mirror symmetry for Del Pezzo surfaces and their mirror Landau-Ginzburg models. In particular, we show that the derived category of coherent sheaves on a Del Pezzo surface X_k obtained by blowing up CP^2 at k points is…

Algebraic Geometry · Mathematics 2009-11-24 Denis Auroux , Ludmil Katzarkov , Dmitri Orlov

We give an equivalence of triangulated categories between the derived category of finitely generated representations of symplectic reflection algebras associated with wreath products (with parameter t=0) and the derived category of coherent…

Representation Theory · Mathematics 2007-05-23 Iain Gordon , S. Paul Smith

Let X be an algebraic variety with an action of an algebraic group G. Suppose X has a full exceptional collection of sheaves, and these sheaves are invariant under the action of the group. We construct a semiorthogonal decomposition of…

Algebraic Geometry · Mathematics 2015-05-13 Alexei Elagin