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A C-motivic modular forms spectrum mmf has recently been constructed. This article presents detailed computational information on the Adams spectral sequence for mmf. This information is essential for computing with the C-motivic and…

Algebraic Topology · Mathematics 2018-11-21 Daniel C. Isaksen

We study the stable motivic homotopy groups $\pi_{s,w}$ of the 2-completion of the motivic sphere spectrum over $\mathbb{C}$. When arranged in the $(s,w)$-plane, these groups break into four different regions: a vanishing region, an…

Algebraic Topology · Mathematics 2015-05-07 Bogdan Gheorghe , Daniel C. Isaksen

We study the motivic Adams-Novikov spectral sequence at an odd prime $l$ over the base fields $\mathbb{C}$ and $\mathbb{R}$. This spectral sequence converges to the stable motivic homotopy groups of the $l$-completed motivic sphere…

Algebraic Topology · Mathematics 2021-01-25 Sven-Torben Stahn

We compute the 2-line of stable homotopy groups of motivic spheres over fields of characteristic not two in terms of motivic cohomology and hermitian K-groups.

Algebraic Geometry · Mathematics 2021-04-01 Oliver Röndigs , Markus Spitzweck , Paul Arne Østvær

We discuss the current state of knowledge of stable homotopy groups of spheres. We describe a new computational method that yields a streamlined computation of the first 61 stable homotopy groups, and gives new information about the stable…

Algebraic Topology · Mathematics 2022-05-25 Daniel C. Isaksen , Guozhen Wang , Zhouli Xu

We establish an isomorphism between the stable homotopy groups of the 2-completed motivic sphere spectrum over the real numbers and the corresponding stable homotopy groups of the 2-completed Z/2-equivariant sphere spectrum, in a certain…

Algebraic Topology · Mathematics 2016-03-31 Daniel Dugger , Daniel C. Isaksen

For groups of prime order, equivariant stable maps between equivariant representation spheres are investigated using the Borel cohomology Adams spectral sequence. Features of the equivariant stable homotopy category, such as stability and…

Algebraic Topology · Mathematics 2011-10-12 Markus Szymik

We compute the $\mathbb{C}$-motivic Adams spectral sequence for $\mathit{mmf}/\tau$. Up to reindexing, this spectral sequence is isomorphic to the algebraic Novikov spectral sequence for topological modular forms. We give a full analysis of…

Algebraic Topology · Mathematics 2024-04-09 J. Francis Baer

This article computes some motivic stable homotopy groups over R. For 0 <= p - q <= 3, we describe the motivic stable homotopy groups of a completion of the motivic sphere spectrum. These are the first four Milnor-Witt stems. We start with…

Algebraic Topology · Mathematics 2017-01-04 Daniel Dugger , Daniel C. Isaksen

Our main purpose is to describe the category of isotropic cellular spectra over flexible fields. Guided by [6], we show that it is equivalent, as a stable $\infty$-category equipped with a $t$-structure, to the derived category of left…

Algebraic Geometry · Mathematics 2023-10-03 Fabio Tanania

We construct a topological model for cellular, 2-complete, stable C-motivic homotopy theory that uses no algebro-geometric foundations. We compute the Steenrod algebra in this context, and we construct a "motivic modular forms" spectrum…

Algebraic Topology · Mathematics 2018-10-29 Bogdan Gheorghe , Daniel C. Isaksen , Achim Krause , Nicolas Ricka

Let k be a field with cohomological dimension less than 3; we call such fields low-dimensional. Examples include algebraically closed fields, finite fields and function fields thereof, local fields, and number fields with no real…

Algebraic Topology · Mathematics 2014-08-15 Kyle M. Ormsby , Paul Arne Østvær

Over any field of characteristic not 2, we establish a 2-term resolution of the $\eta$-periodic, 2-local motivic sphere spectrum by shifts of the connective 2-local Witt K-theory spectrum. This is curiously similar to the resolution of the…

K-Theory and Homology · Mathematics 2021-05-05 Tom Bachmann , Michael J. Hopkins

Let $kq$ denote the very effective cover of Hermitian K-theory. We apply the $kq$-based motivic Adams spectral sequence, or $kq$-resolution, to computational motivic stable homotopy theory. Over base fields of characteristic not two, we…

Algebraic Topology · Mathematics 2020-12-29 Dominic Leon Culver , J. D. Quigley

Working over an algebraically closed field $k$ of characteristic $0$, we show that the motivic stable homotopy groups of the sphere spectrum can be determined entirely from the motivic homotopy groups of the $p$-completed sphere spectra and…

Algebraic Topology · Mathematics 2026-03-10 Sebastian Gant , Ben Williams

In this paper, we introduce fundamental notions of homotopy theory, including homotopy excision and the Freudenthal suspension theorem. We then explore framed cobordism and its connection to stable homotopy groups of spheres through the…

Algebraic Topology · Mathematics 2025-03-17 Trishan Mondal

In this paper, we investigate the rigidity of the stable comodule category of a specific class of Hopf algebroids known as finite Adams, shedding light on its Picard group. Then we establish a reduction process through base changes,…

Algebraic Topology · Mathematics 2023-06-23 Xu Gao , Ang Li

We describe some periodic structure in the cohomology of the moduli stack of 1-dimensional formal group laws, also known as the $E_2$-page of the classical Adams--Novikov spectral sequence. This structure is distinct from the familiar…

Algebraic Topology · Mathematics 2025-04-24 Daniel C. Isaksen , Hana Jia Kong , Guchuan Li , Yangyang Ruan , Heyi Zhu

This paper contains an overview of background from stable homotopy theory used by Freed--Hopkins in their work on invertible extended topological field theories. We provide a working guide to the stable homotopy category, to the Steenrod…

Algebraic Topology · Mathematics 2018-05-10 Agnes Beaudry , Jonathan A. Campbell

We prove strong convergence results for the motivic Adams spectral sequence of the sphere spectrum over fields with finite virtual cohomological dimension at the prime 2, and over arbitrary fields at odd primes. We show that the motivic…

Algebraic Topology · Mathematics 2019-01-14 Jonas Irgens Kylling , Glen Matthew Wilson