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Trace and Künneth formulas for singularity categories and applications

Part of: Algebraic number theory: local and $p$-adic fields Topological $K$-theory

Published online by Cambridge University Press:  03 June 2022

Bertrand Toën  and
Gabriele Vezzosi
Bertrand Toën
Affiliation:
IMT, CNRS, Université de Toulouse, 118, route de Narbonne, 31062 Toulouse Cedex 9, France bertrand.toen@math.univ-toulouse.fr
Gabriele Vezzosi
Affiliation:
DIMAI, Università di Firenze, Viale Morgagni, 67/a, 50134 Firenze, Italy gabriele.vezzosi@unifi.it
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Abstract

We present an $\ell$-adic trace formula for saturated and admissible dg-categories over a base monoidal differential graded (dg)-category. Moreover, we prove Künneth formulas for dg-category of singularities and for inertia-invariant vanishing cycles. As an application, we prove a categorical version of Bloch's conductor conjecture (originally stated by Spencer Bloch in 1985), under the additional hypothesis that the monodromy action of the inertia group is unipotent.

Keywords

trace formulasnon-commutative geometryvanishing cyclesBloch's conductor conjecture

MSC classification

Secondary: 19L10: Riemann-Roch theorems, Chern characters 11S15: Ramification and extension theory
Type
Research Article
Information
Compositio Mathematica , Volume 158 , Issue 3 , March 2022 , pp. 483 - 528
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Copyright
© 2022 The Author(s). The publishing rights in this article are licensed to Foundation Compositio Mathematica under an exclusive licence

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Footnotes

BT is partially supported by ERC-2016-ADG-741501 and ANR-11-LABX-0040-CIMI within the program ANR-11-IDEX-0002-02.

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