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Hermitian K-theory for stable $\infty$-categories II: Cobordism categories and additivity

Abstract : We define Grothendieck-Witt spectra in the setting of Poincar\'e $\infty$-categories, show that they fit into an extension with a K- and an L-theoretic part and deduce localisation sequences for Verdier quotients. As special cases we obtain generalisations of Karoubi's fundamental and periodicity theorems for rings in which 2 need not be invertible. A novel feature of our approach is the systematic use of ideas from cobordism theory by interpreting the hermitian Q-construction as an algebraic cobordism category. We also use this to give a new description of the LA-spectra of Weiss and Williams.
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Preprints, Working Papers, ...
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Contributor : Baptiste Calmès <>
Submitted on : Wednesday, September 16, 2020 - 9:17:35 PM
Last modification on : Thursday, September 16, 2021 - 10:26:06 AM

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  • HAL Id : hal-02941256, version 1
  • ARXIV : 2009.07224



Baptiste Calmès, Emanuele Dotto, Yonatan Harpaz, Fabian Hebestreit, Markus Land, et al.. Hermitian K-theory for stable $\infty$-categories II: Cobordism categories and additivity. 2020. ⟨hal-02941256⟩



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