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For a noetherian scheme, we introduce its unbounded stable derived category. This leads to a recollement which reflects the passage from the bounded derived category of coherent sheaves to the quotient modulo the subcategory of perfect…

Algebraic Geometry · Mathematics 2007-05-23 Henning Krause

We prove an effective stabilization result for the sheaf cohomology groups of line bundles on flag varieties parametrizing complete flags in k^n, as well as for the sheaf cohomology groups of polynomial functors applied to the cotangent…

Algebraic Geometry · Mathematics 2026-02-10 Claudiu Raicu , Keller VandeBogert

We define an unstable equivariant motivic homotopy category for an algebraic group over a Noetherian base scheme. We show that equivariant algebraic $K$-theory is representable in the resulting homotopy category. Additionally, we establish…

Algebraic Topology · Mathematics 2015-10-19 Jeremiah Heller , Amalendu Krishna , Paul Arne Ostvaer

We establish the stable homotopy classification of elliptic pseudodifferential operators on manifolds with corners and show that the set of elliptic operators modulo stable homotopy is isomorphic to the K-homology group of some stratified…

K-Theory and Homology · Mathematics 2007-05-23 V. E. Nazaikinskii , A. Yu. Savin , B. Yu. Sternin

We study the moduli spaces which classify smooth surfaces along with a complex line bundle. There are homological stability and Madsen--Weiss type results for these spaces (mostly due to Cohen and Madsen), and we discuss the cohomological…

Algebraic Topology · Mathematics 2015-01-30 Johannes Ebert , Oscar Randal-Williams

For closed manifolds with compact Lie group actions, we study Austin-Braam's Morse-theoretic construction of Borel equivariant cohomology using the technique of stabilization. We show that a $C^1$-small equivariant perturbation produces…

Differential Geometry · Mathematics 2026-01-23 Erkao Bao , Robi Huq , Shengzhen Ning

We provide a calculational method for rational stable equivariant homotopy theory for a torus G based on the homology of the Borel construction on fixed points. More precisely we define an abelian torsion model, A_t(G) of finite injective…

Algebraic Topology · Mathematics 2022-11-15 J. P. C. Greenlees

A general structure theorem on higher order invariants is proven. For an arithmetic group, the structure of the corresponding Hecke module is determined. It is shown that the module does not contain any irreducible submodule. This explains…

Number Theory · Mathematics 2017-09-04 Anton Deitmar

We prove two results on convex subsets of Euclidean spaces invariant under an orthogonal group action. First, we show that invariant spectrahedra admit an equivariant spectrahedral description, i.e., can be described by an equivariant…

Algebraic Geometry · Mathematics 2025-11-05 Renato G. Bettiol , Mario Kummer , Ricardo A. E. Mendes

The $2$-primary Hopf invariant $1$ elements in the stable homotopy groups of spheres form the most accessible family of elements. In this paper we explore some properties of the $\mathcal{E}_\infty$ ring spectra obtained from certain…

Algebraic Topology · Mathematics 2017-04-18 Andrew Baker

We revisit methods of proof of the Adams Conjecture in order to correct and supplement earlier efforts to prove analogous conjectures in the stable homotopy category. We utilize simplicial schemes over an algebraically closed field of…

Algebraic Topology · Mathematics 2026-01-16 Eric M. Friedlander

We use representation theory to construct spaces of matrices of constant rank. These spaces are parametrized by the natural representation of the general linear group or the symplectic group. We present variants of this idea, with more…

Algebraic Geometry · Mathematics 2022-12-09 J. M. Landsberg , L. Manivel

We compute the (stable) \'etale cohomology of $\mathrm{Hom}_{n}(C, \mathcal{P}(\vec{\lambda}))$, the moduli stack of degree $n$ morphisms from a smooth projective curve $C$ to the weighted projective stack $\mathcal{P}(\vec{\lambda})$, the…

Algebraic Geometry · Mathematics 2022-07-07 Oishee Banerjee , Jun-Yong Park , Johannes Schmitt

We show that if G is a finite constant group acting on a scheme X such that the order of G is invertible in the residue fields of X, then the G-equivariant motivic stable homotopy category of X is equivalent to the stabilization of the…

K-Theory and Homology · Mathematics 2022-05-31 Tom Bachmann

This replacement corrects statement and proof of the main result. Also, a section on the universal Abel-Jacobi map has been added.

alg-geom · Mathematics 2008-02-03 Eduard Looijenga

Lie groupoids generalize transformation groups, and so provide a natural language for studying orbifolds and other noncommutative geometries. In this paper, we investigate a connection between orbifolds and equivariant stable homotopy…

Algebraic Topology · Mathematics 2007-05-23 Johann K. Leida

We define and study bivariant equivariant periodic cyclic homology for actions of ample groupoids. In analogy to the group case, we show that the theory satisfies homotopy invariance, stability, and excision in both variables. We also prove…

K-Theory and Homology · Mathematics 2026-02-20 Francesco Pagliuca , Christian Voigt

We determine the quantum cohomology of the moduli space of odd degree rank two stable vector bundles over a Riemann surface $\Sigma$ of any genus. This work together with dg-ga/9710029 prove that this quantum cohomology is isomorphic to the…

alg-geom · Mathematics 2007-05-23 Vicente Muñoz

We study the moduli space of rank stable based instantons over a connected sum of q copies of CP^2. For c_2=1 we give the homotopy type of the moduli space. For c_2=2 we compute the cohomology of the moduli space.

Algebraic Geometry · Mathematics 2007-05-23 Joao Paulo Santos

A cohomological study is made of an equivariant map betwen the configuration space of n points in space and the flag manifold of U(n).

Algebraic Topology · Mathematics 2007-05-23 Michael Atiyah
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