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Motivated by the splitting principle, we define certain simplicial complexes associated to an associative ring $A$, which have an action of the general linear group $GL(A)$. This leads to an exact sequence, involving Quillen's algebraic…

Algebraic Geometry · Mathematics 2015-03-17 M. V. Nori , V. Srinivas

The affine Grassmannian associated to a reductive group $\mathbf{G}$ is an affine analogue of the usual flag varieties. It is a rich source of Poisson varieties and their symplectic resolutions. These spaces are examples of conical…

Algebraic Geometry · Mathematics 2022-11-01 Ivan Danilenko

We solve a motivic version of the Adams conjecture with the exponential characteristic of the base field inverted. In the way of the proof we obtain a motivic version of mod k Dold theorem and give a motivic version of Brown's trick…

K-Theory and Homology · Mathematics 2025-05-09 Alexey Ananyevskiy , Elden Elmanto , Oliver Röndigs , Maria Yakerson

We consider slice filtrations in logarithmic motivic homotopy theory. Our main results establish conjectured compatibilities with the Beilinson, BMS, and HKR filtrations on (topological, log) Hochschild homology and related invariants. In…

Algebraic Geometry · Mathematics 2025-08-20 Federico Binda , Doosung Park , Paul Arne Østvær

We compute the 1-line of stable homotopy groups of motivic spheres over fields of characteristic not two in terms of hermitian and Milnor K-groups. This is achieved by solving questions about convergence and differentials in the slice…

Algebraic Topology · Mathematics 2018-08-15 Oliver Röndigs , Markus Spitzweck , Paul Arne Østvær

We consider K\"ahler toric manifolds $N$ that are torifications of statistical manifolds $\mathcal{E}$ in the sense of [M. Molitor, "K\"ahler toric manifolds from dually flat spaces", arXiv:2109.04839], and prove a geometric analogue of the…

Differential Geometry · Mathematics 2023-05-18 Mathieu Molitor

The Kauffman bracket skein algebra is a quantization of the algebra of regular functions on the $SL_2$ character variety of a topological surface. We realize the skein algebra of the $4$-punctured sphere as the output of a mirror symmetry…

Geometric Topology · Mathematics 2025-09-30 Pierrick Bousseau

It was suggested by Kontsevich that the Grothendieck-Teichmueller group GT should act on the Duflo isomorphism of su(2) but the corresponding realization of GT turned out to be trivial. We show that a solvable quotient of the motivic Galois…

High Energy Physics - Theory · Physics 2009-01-07 Harald Grosse , Karl-Georg Schlesinger

In this paper, we calculate the image of the connective and periodic rational equivariant complex $K$-theory spectrum in the algebraic model for naive-commutative ring $G$-spectra given by Barnes, Greenlees and K\k{e}dziorek for finite…

Algebraic Topology · Mathematics 2023-03-15 Anna Marie Bohmann , Christy Hazel , Jocelyne Ishak , Magdalena Kędziorek , Clover May

Let k be a field of characteristic not 2. We conjecture that if X is a quasi-projective k-variety with trivial motivic Euler characteristic, then Sym$^n$X has trivial motivic Euler characteristic for all n. Conditional on this conjecture,…

Algebraic Geometry · Mathematics 2025-01-08 Dori Bejleri , Stephen McKean

To a finite quiver equipped with a positive integer on each of its vertices, we associate a holomorphic symplectic manifold having some parameters. This coincides with Nakajima's quiver variety with no stability parameter/framing if the…

Representation Theory · Mathematics 2010-10-27 Daisuke Yamakawa

We prove the equivalence between the categories of motives of rigid analytic varieties over a perfectoid field $K$ of mixed characteristic and over the associated (tilted) perfectoid field $K^{\flat}$ of equal characteristic. This can be…

Algebraic Geometry · Mathematics 2019-02-20 Alberto Vezzani

We show that in Grayson's model of higher algebraic $K$-theory using binary acyclic complexes, the complexes of length two suffice to generate the whole group. Moreover, we prove that the comparison map from Nenashev's model for $K_1$ to…

K-Theory and Homology · Mathematics 2021-05-28 Daniel Kasprowski , Christoph Winges

We study the "higher algebra" of spectral Mackey functors, which the first named author introduced in Part I of this paper. In particular, armed with our new theory of symmetric promonoidal $\infty$-categories and a suitable generalization…

Algebraic Topology · Mathematics 2019-04-03 C. Barwick , S. Glasman , J. Shah

We extend the theory of equivariant orthogonal spectra from finite groups to profinite groups, and more generally from compact Lie groups to compact Hausdorff groups. The G-homotopy theory is "pieced together" from the G/U-homotopy theories…

Algebraic Topology · Mathematics 2014-11-11 Halvard Fausk

It is shown that the K-theory of every noetherian base scheme of finite Krull dimension is represented by a strict ring object in the setting of motivic stable homotopy theory. The adjective `strict' is used to distinguish between the type…

Algebraic Topology · Mathematics 2009-07-24 Oliver Röndigs , Markus Spitzweck , Paul Arne Østvær

In this paper, we construct a stratification tower for the equivariant slice filtration. This tower stratifies the slice spectral sequence of a $G$-spectrum $X$ into distinct regions. Within each of these regions, the differentials are…

Algebraic Topology · Mathematics 2024-03-12 Lennart Meier , XiaoLin Danny Shi , Mingcong Zeng

We construct two functorial filtrations on the algebraic $K$-theory of schemes of finite type over a field $k$ that may admit arbitrary singularities and may be non-reduced, one called the coniveau filtration, and the other called the…

K-Theory and Homology · Mathematics 2021-12-30 Jinhyun Park , Pablo Pelaez

Let $G$ be a group and $S$ a unital epsilon-strongly $G$-graded algebra. We construct spectral sequences converging to the Hochschild (co)homology of $S$. Each spectral sequence is expressed in terms of the partial group (co)homology of $G$…

K-Theory and Homology · Mathematics 2025-07-23 Emmanuel Jerez

Let Map_T(K,X) denote the mapping space of continuous based functions between two based spaces K and X. If K is a fixed finite complex, Greg Arone has recently given an explicit model for the Goodwillie tower of the functor sending a space…

Algebraic Topology · Mathematics 2014-10-01 Stephen T. Ahearn , Nicholas J. Kuhn