The zeroth stable homotopy groups of motivic spheres over the integers

Abstract

The main result determines the zeroth integral Milnor-Witt stem of the motivic sphere spectrum in the Morel-Voevodsky motivic stable homotopy category of the integers. The component in weight zero is the Grothendieck-Witt ring of nondegenerate symmetric bilinear forms over the integers. Along the way, cellularity of connective Witt theory, as well as an absolute purity result for the η-inverted motivic sphere spectrum, is established over Dedekind domains of mixed characteristic.

arXiv comment25 pages, no figures, no AI. v2: Removed incorrect proof and the statements depending on it; main result is unchanged