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In this article we continue the development of a theory of noncommutative motives. We construct categories of A1-homotopy noncommutative motives, described their universal properties, and compute their spectra of morphisms in terms of…

代数几何 · 数学 2014-02-19 Goncalo Tabuada

In this paper, we construct an equivariant coarse homology theory with values in the category of non-commutative motives of Blumberg, Gepner and Tabuada, with coefficients in any small additive category. Equivariant coarse K-theory is…

K理论与同调 · 数学 2017-05-18 Ulrich Bunke , Denis-Charles Cisinski

We construct multiplicative norms on equivariant nonconnective algebraic $K$-theory for finite groups $G$. We also construct a genuine equivariant version of THH equipped with a Dennis trace map from K-theory compatible with the…

K理论与同调 · 数学 2026-03-18 Kaif Hilman , Maxime Ramzi

We study algebraic K-theory and topological Hochschild homology in the setting of bimodules over a stable category, a datum we refer to as a laced category. We show that in this setting both K-theory and THH carry universal properties, the…

代数拓扑 · 数学 2026-03-03 Yonatan Harpaz , Thomas Nikolaus , Victor Saunier

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…

代数拓扑 · 数学 2015-10-19 Jeremiah Heller , Amalendu Krishna , Paul Arne Ostvaer

Let $\V$ be a symmetric monoidal model category and let $X$ be an object in $\V$. From this we can construct a new symmetric monoidal model category $Sp^{\Sigma}(\V,X)$ of symmetric spectra objects in $\V$ with respect to $X$, together with…

代数几何 · 数学 2013-06-18 Marco Robalo

We continue the work initiated in arXiv:1206.3645, where we introduced a new stable symmetric monoidal $(\infty,1)$-category $SH_{nc}$ encoding a motivic stable homotopy theory for the noncommutative spaces of Kontsevich and obtained a…

K理论与同调 · 数学 2013-06-18 Marco Robalo

For an atomic orbital base category in the sense of Barwick-Dotto-Glasman-Nardin-Shah, we introduce the category of parametrised perfect-stable categories and use it to construct the parametrised version of noncommutative motives in which…

K理论与同调 · 数学 2026-03-18 Kaif Hilman

We provide a fairly self-contained account of the localisation and cofinality theorems for the algebraic $\mathrm{K}$-theory of stable $\infty$-categories. It is based on a general formula for the evaluation of an additive functor on a…

K理论与同调 · 数学 2023-03-15 Fabian Hebestreit , Andrea Lachmann , Wolfgang Steimle

In this paper we establish a universal characterization of higher algebraic K-theory in the setting of small stable infinity categories. Specifically, we prove that connective algebraic K-theory is the universal additive invariant, i.e.,…

K理论与同调 · 数学 2015-03-13 Andrew J. Blumberg , David Gepner , Goncalo Tabuada

A kind of motivic stable homotopy theory of algebras is developed. Explicit fibrant replacements for the $S^1$-spectrum and $(S^1,\mathbb G)$-bispectrum of an algebra are constructed. As an application, unstable, Morita stable and stable…

K理论与同调 · 数学 2016-08-03 Grigory Garkusha

This note is the sequel to [A note on secondary K-theory. Algebra and Number Theory 10 (2016), no. 4, 887-906]. Making use of the recent theory of noncommutative motives, we prove that the canonical map from the derived Brauer group to the…

代数几何 · 数学 2017-05-09 Goncalo Tabuada

We define a class of motivic equivalences of small stable $\infty$-categories $W_{\mathrm{mot}}$ and show that the Dwyer--Kan localization functor $\mathrm{Cat}^{\mathrm{perf}}_\infty \to…

K理论与同调 · 数学 2025-03-17 Maxime Ramzi , Vladimir Sosnilo , Christoph Winges

We develop a theory of motivic spectra in a broad generality; in particular $\mathbb{A}^1$-homotopy invariance is not assumed. As an application, we prove that $K$-theory of schemes is a universal Zariski sheaf of spectra which is equipped…

代数几何 · 数学 2025-04-18 Toni Annala , Ryomei Iwasa

Given a finite group G, we develop a theory of G-equivariant noncommutative motives. This theory provides a well-adapted framework for the study of G-schemes, Picard groups of schemes, G-algebras, 2-cocycles, equivariant algebraic K-theory,…

代数几何 · 数学 2016-08-24 Goncalo Tabuada

In this paper we introduce and study the so-called continuous $K$-theory for a certain class of "large" stable $\infty$-categories, more precisely, for dualizable presentable categories. For compactly generated categories, the continuous…

K理论与同调 · 数学 2025-02-07 Alexander I. Efimov

In this article we study the K-theory of endomorphisms using noncommutative motives. We start by extending the K-theory of endomorphisms functor from ordinary rings to (stable) infinity categories. We then prove that this extended functor…

代数拓扑 · 数学 2013-02-07 Andrew J. Blumberg , David Gepner , Goncalo Tabuada

Let k be a perfect field and A a finite dimensional k-algebra of finite global dimension (e.g. the path algebra of a finite quiver without oriented cycles). Making use of the recent theory of noncommutative motives, we prove that the value…

K理论与同调 · 数学 2013-05-07 Marcello Bernardara , Goncalo Tabuada

Assuming the K\"unneth type standard conjecture, we propose a way to describe objects of mixed motives explicitly. We study their formal properties, and we associate mixed motives to schemes smooth and separated over a field. This serves as…

代数几何 · 数学 2020-01-31 Doosung Park

We formulate and prove a Conner-Floyd isomorphism for the algebraic K-theory of arbitrary qcqs derived schemes. To that end, we study a stable $\infty$-category of non-$\mathbb A^1$-invariant motivic spectra, which turns out to be…

代数几何 · 数学 2024-02-15 Toni Annala , Marc Hoyois , Ryomei Iwasa
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