English

Stable connectivity over a base

Algebraic Geometry 2020-01-03 v3

Abstract

Morel's stable connectivity theorems state that for any connective S1S^1-spectrum FF of motivic spaces (Nisnevich simplicial sheaves) over an arbitrary field, the spectrum LA1(F)L_{\mathbb A^1}(F) is connective, and the same property for P1\mathbb P^1-spectra of motivic spaces. Here LA1L_{\mathbb A^1} denotes the A1\mathbb A^1-localisation in the category of motivic spectra over a field kk. Originally the same property was conjectured for the case of motivic S1S^1-spectra over a base scheme SS.In view of Ayoub's conterexamples the modified version of conjecture states that LA1(F)L_{\mathbb A^1}(F) is (d)(-d)-connective for any connective FF, where d=dimSd=\mathrm{dim} S is the Krull dimension. The conjecture is proven under the infiniteness assumption on the residue fields for the cases of Dedekind schemes by J.~Schmidt and F.~Strunk and noetherian domains of arbitrary dimension by N.~Deshmukh, A.~Hogadi, G.~Kulkarni and S.~Yadavand. In the article we prove the result or general base with out the assumption on the residue fields. So by the result for any smooth scheme XX over a base scheme SS of Krull dimension dd the Nisnevich sheaves of S1S^1-stable motivic homotopy groups πiS1(X)\pi_i^{S^1}(X) and P1\mathbb P^1-stable motivic homotopy groups πi+j,jP1(X)\pi_{i+j,j}^{\mathbb P^1}(X) vanishes for all i<di<-d.

Keywords

Cite

@article{arxiv.1911.05014,
  title  = {Stable connectivity over a base},
  author = {A. Druzhinin},
  journal= {arXiv preprint arXiv:1911.05014},
  year   = {2020}
}

Comments

The references in the abstract are replaced by surnames. Some typos in the text of the article are corrected

R2 v1 2026-06-23T12:13:19.551Z