English

Comparing motives of smooth algebraic varieties

Algebraic Geometry 2018-11-13 v2 Category Theory K-Theory and Homology

Abstract

Given a perfect field of exponential characteristic ee and a functor f:ABf:\mathcal A\to\mathcal B between symmetric monoidal strict VV-categories of correspondences satisfying the cancellation property such that the induced morphisms of complexes of Nisnevich sheaves f:ZA(q)[1/e]ZB(q)[1/e],q0,f_*:\mathbb Z_{\mathcal A}(q)[1/e]\to\mathbb Z_{\mathcal B}(q)[1/e],\quad q\geq 0, are quasi-isomorphisms, it is proved that for every kk-smooth algebraic variety XX the morphisms of twisted motives of XX with Z[1/e]\mathbb Z[1/e]-coefficients MA(X)(q)Z[1/e]MB(X)(q)Z[1/e]M_{\mathcal A}(X)(q)\otimes\mathbb Z[1/e]\to M_{\mathcal B}(X)(q)\otimes\mathbb Z[1/e] are quasi-isomorphisms. Furthermore, it is shown that the induced functors between triangulated categories of motives DMAeff(k)[1/e]DMBeff(k)[1/e],DMA(k)[1/e]DMB(k)[1/e]DM_{\mathcal A}^{eff}(k)[1/e]\to DM_{\mathcal B}^{eff}(k)[1/e],\quad DM_{\mathcal A}(k)[1/e]\to DM_{\mathcal B}(k)[1/e] are equivalences. As an application, the Cor-, K0K_0^\oplus-, K0K_0- and K0\mathbb K_0-motives of smooth algebraic varieties with Z[1/e]\mathbb Z[1/e]-coefficients are locally quasi-isomorphic to each other. Moreover, their triangulated categories of motives with Z[1/e]\mathbb Z[1/e]-coefficients are shown to be equivalent. Another application is given for the bivariant motivic spectral sequence.

Keywords

Cite

@article{arxiv.1709.09097,
  title  = {Comparing motives of smooth algebraic varieties},
  author = {Grigory Garkusha},
  journal= {arXiv preprint arXiv:1709.09097},
  year   = {2018}
}

Comments

accepted in C. R. Math. Acad. Sci. Paris

R2 v1 2026-06-22T21:55:31.163Z