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We consider complex-balanced mass-action systems, or toric dynamical systems. They are remarkably stable polynomial dynamical systems arising from reaction networks seen as Euclidean embedded graphs. We study the moduli spaces of toric…

Dynamical Systems · Mathematics 2023-05-03 Gheorghe Craciun , Jiaxin Jin , Miruna-Stefana Sorea

We give an explicit presentation of the integral Chow ring of a stack of smooth plane cubics. We also determine some relations in the general case of hypersurfaces of any dimension and degree.

Algebraic Geometry · Mathematics 2018-01-16 Damiano Fulghesu , Angelo Vistoli

We explain a correspondence between some invariants in the dynamics of color exchange in a 2d coloring problem, which are polynomials of winding numbers, and linking numbers in 3d. One invariant is visualized as linking of lines on a…

Geometric Topology · Mathematics 2021-02-24 O. Cépas , P. M. Akhmetiev

In this article, we propose a way of seeing the noncommutative tori in the category of noncommutative motives. As an algebra, the noncommutative torus is lack the smoothness property required to define a noncomutative motive. Thus, instead…

Algebraic Geometry · Mathematics 2014-03-11 Yunyi Shen

We investigate moduli stacks of pointed chains of projective lines related to the Losev-Manin moduli spaces and show that these moduli stacks coincide with certain toric stacks which can be described in terms of the Cartan matrices of root…

Algebraic Geometry · Mathematics 2015-12-02 Mark Blume

We give a complete classification of the torus-equivariant birational equivalence classes of smooth proper toric Deligne-Mumford stacks with trivial generic stabilizer in terms of their associated stacky fans.

Algebraic Geometry · Mathematics 2023-08-22 Johannes Schmitt

This is a short summary of main results of our paper arXiv:0811.2435 where the concept of motivic Donaldson-Thomas invariant was introduced. It also contains a discussion of some open questions from the loc.cit., in particular, the geometry…

Algebraic Geometry · Mathematics 2010-02-07 Maxim Kontsevich , Yan Soibelman

We construct smooth presentations of algebraic stacks that are local epimorphisms in the Morel-Voevodsky $\mathbb{A}^1$-homotopy category. As a consequence we show that the motive of a smooth stack (in Voevodsky's triangulated category of…

Algebraic Geometry · Mathematics 2025-01-28 Neeraj Deshmukh , Jack Hall

We give a valuative criterion for when a smooth algebraic stack with a separated good moduli space is the quotient of a separated Deligne-Mumford stack by a torus. For doing so, we introduce a new class of morphisms, the so-called effective…

Algebraic Geometry · Mathematics 2024-01-29 Andrea Di Lorenzo , Giovanni Inchiostro

Motivated by localization theorems on moduli spaces, we prove a structural classification of Deligne-Mumford stacks with an action of a torus where the induced action on the coarse moduli space is trivial. We also establish a general local…

Algebraic Geometry · Mathematics 2024-02-19 Jarod Alper , Felix Janda

In this paper, we determine the motive of the classifying torsor of an algebraic torus. As a result, we give an exact sequence describing the degree 4 cohomological invariants of algebraic tori. Using results by Blinstein and Merkurjev,…

Algebraic Geometry · Mathematics 2025-10-13 Cyril Demarche , Hanqing Long

We study toric varieties over an arbitrary field with an emphasis on toric surfaces in the Merkurjev-Panin motivic category of "K-motives". We explore the decomposition of certain toric varieties as K-motives into products of central simple…

Algebraic Geometry · Mathematics 2018-09-14 Fei Xie

In this paper we study the embedded topology of reducible plane curves having a smooth irreducible component. In previous studies, the relation between the topology and certain torsion classes in the Picard group of degree zero of the…

Algebraic Geometry · Mathematics 2022-06-01 E. Artal Bartolo , S. Bannai , T. Shirane , H. Tokunaga

The logarithmic multiplicative group is a proper group object in logarithmic schemes, which morally compactifies the usual multiplicative group. We study the structure of the stacks of logarithmic maps from rational curves to this…

Algebraic Geometry · Mathematics 2020-03-31 Dhruv Ranganathan , Jonathan Wise

We describe the class, in the Grothendieck group of stacks, of the stack of twisted $G$-covers of genus $0$ curves, in terms of the loci corresponding to covers over smooth bases.

Algebraic Geometry · Mathematics 2023-12-29 Massimo Bagnarol , Fabio Perroni

In this paper, we explicitly describe the orbifold pseudo-effective cone of a split toric stack.

Algebraic Geometry · Mathematics 2025-11-25 Ratko Darda , Takehiko Yasuda

We develop a motivic cohomology theory, representable in the Voevodsky's triangulated category of motives, for smooth separated Deligne-Mumford stacks and show that the resulting higher Chow groups are canonically isomorphic to the higher…

Algebraic Geometry · Mathematics 2025-05-30 Utsav Choudhury , Neeraj Deshmukh , Amit Hogadi

In this paper, we introduce the notions of motivic representation stability that is an algebraic counterpart of the notion of representation stability. In the process, we also introduce the notion of motivic decomposition for varieties…

Algebraic Geometry · Mathematics 2025-05-13 Márton Hablicsek , Jesse Vogel

An equivariant linear system on a toric variety is a linear system invariant under the torus action. We study the number of irreducible components of the complete intersection of general divisors from a fixed collection of equivariant…

Algebraic Geometry · Mathematics 2025-08-04 Andrey Zhizhin

We prove a Horrocks-type splitting criterion for arbitrary smooth projective toric varieties under an additional hypothesis similar to the case of products of projective spaces by Eisenbud--Erman--Schreyer.

Algebraic Geometry · Mathematics 2024-12-30 Mahrud Sayrafi