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Let X be a T-variety, where T is an algebraic torus. We describe a fully faithful functor from the category of T-equivariant vector bundles on X to a certain category of filtered vector bundles on a suitable quotient of X by T. We show that…

Algebraic Geometry · Mathematics 2019-11-26 Nathan Ilten , Hendrik Süß

In his fundamental work, Quillen developed the theory of the cotangent complex as a universal abelian derived invariant, and used it to define and study a canonical form of cohomology, encompassing many known cohomology theories. Additional…

Algebraic Topology · Mathematics 2023-11-21 Yonatan Harpaz , Joost Nuiten , Matan Prasma

In this paper, we develop a structure theory for generalized spectral sequences, which are derived from chain complexes that are filtered over arbitrary partially ordered sets. Also, a more general construction method reminiscent of exact…

Algebraic Topology · Mathematics 2022-03-21 Benjamin Matschke

We obtain combinatorial model categories of parametrised spectra, together with systems of base change Quillen adjunctions associated to maps of parameter spaces. We work with simplicial objects and use Hovey's sequential and symmetric…

Algebraic Topology · Mathematics 2021-05-05 Vincent Braunack-Mayer

We enlarge the category of bornological coarse spaces by adding transfer morphisms and introduce the notion of an equivariant coarse homology theory with transfers. We then show that equivariant coarse algebraic $K$-homology and equivariant…

K-Theory and Homology · Mathematics 2021-05-28 Ulrich Bunke , Alexander Engel , Daniel Kasprowski , Christoph Winges

Computation of the K- and KO-theory for the classifying G-spaces for proper actions of certain infinite discrete groups G via a special version of the equivariant Atiyah- Hirzebruch spectral sequence.

K-Theory and Homology · Mathematics 2023-03-24 Mario Fuentes

Following ideas of Lurie, we give in this article a general construction of equivariant elliptic cohomology without restriction to characteristic zero. Specializing to the universal elliptic curve we obtain in particular equivariant spectra…

Algebraic Topology · Mathematics 2023-07-21 David Gepner , Lennart Meier

In this work we extend the well-known spectral cover construction first developed by Friedman, Morgan, and Witten to describe more general vector bundles on elliptically fibered Calabi-Yau geometries. In particular, we consider the case in…

High Energy Physics - Theory · Physics 2020-05-20 Lara B. Anderson , Xin Gao , Mohsen Karkheiran

We compare derived categories of the category of strict polynomial functors over a finite field and the category of ordinary endofunctors on the category of vector spaces. We introduce two intermediate categories: the category of…

K-Theory and Homology · Mathematics 2022-07-27 Marcin Chałupnik

The project of Greenlees et al. on understanding rational G-spectra in terms of algebraic categories has had many successes, classifying rational G-spectra for finite groups, SO(2), O(2), SO(3), free and cofree G-spectra as well as rational…

Algebraic Topology · Mathematics 2021-02-03 David Barnes , Magdalena Kedziorek

We show that the category of symmetric spectra can be used as a model for global equivariant homotopy theory of finite groups.

Algebraic Topology · Mathematics 2019-05-29 Markus Hausmann

Inspired by equivariant homotopy theory, equivariant algebra studies generalisations of G-Mackey functors that do not have all transfer maps (also known as induction maps), for G a finite group. These incomplete Mackey functors have…

Algebraic Topology · Mathematics 2025-11-05 David Barnes , Michael A. Hill , Magdalena Kedziorek

We describe a deformation of the $\infty$-category of Borel $G$-spectra for a finite group $G$. This provides a new presentation of the $a$-complete real Artin--Tate motivic stable homotopy category when $G=C_2$ and gives a new…

Algebraic Topology · Mathematics 2025-11-18 Gabriel Angelini-Knoll , Mark Behrens , Eva Belmont , Hana Jia Kong

We determine a characterization of all 2-slices of equivariant spectra over the Klein four-group $C_2\times C_2$. We then describe all slices of integral suspensions of the equivariant Eilenberg-MacLane spectrum $H\underline{\mathbb{Z}}$…

Algebraic Topology · Mathematics 2021-06-08 Carissa Slone

We prove that Waldhausen K-theory, when extended to a very general class of quasicategories, can be described as a Goodwillie differential. In particular, K-theory spaces admit canonical (connective) deloopings, and the K-theory functor…

K-Theory and Homology · Mathematics 2017-05-17 C. Barwick

We present an elementary construction of the non-connective algebraic K-theory spectrum associated to an additive category following the contracted functor approach due to Bass. It comes with a universal property that easily allows us to…

K-Theory and Homology · Mathematics 2013-09-05 Wolfgang Lueck , Wolfgang Steimle

This paper studies the Eilenberg Moore construction on DG categories. As applications one proves results on factoring of monads as composition of a pair of adjoint exact functors and further applications to reinterpretations of equivariant…

Algebraic Geometry · Mathematics 2018-08-08 Umesh V. Dubey , Vivek Mohan Mallick

We define a right Cartan-Eilenberg structure on the category of Kan's combinatorial spectra, and the category of sheaves of such spectra, assuming some conditions. In both structures, we use the geometric concept of homotopy equivalence as…

Algebraic Topology · Mathematics 2017-10-03 Ruian Chen , Igor Kriz , Aleš Pultr

Free and cofree equivariant spectra are important classes of equivariant spectra which represent equivariant cohomology theories on free equivariant spaces. Greenlees-Shipley and Pol and the author have given an algebraic model for rational…

Algebraic Topology · Mathematics 2022-05-06 Jordan Williamson

We introduce and compare two approaches to equivariant homotopy theory in a topological or ordinary Quillen model category. For the topological model category of spaces, we generalize Piacenza's result that the categories of topological…

Algebraic Topology · Mathematics 2017-03-06 Marc Stephan
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