Noncommutative CW-spectra as enriched presheaves on matrix algebras

Gregory Arone, Ilan Barnea, Tomer M. Schlank

Research output: Contribution to journalArticlepeer-review


Motivated by the philosophy that C *-algebras reflect noncommutative topology, we investigate the stable homotopy theory of the (opposite) category of C *-algebras. We focus on C *-algebras which are noncommutative CW-complexes in the sense of Eilers et al. (1998). We construct the stable 1-category of noncommutative CW-spectra, which we denote by NSp. Let M be the full spectral subcategory of NSp spanned by “noncommutative suspension spectra” of matrix algebras. Our main result is that NSp is equivalent to the 1-category of spectral presheaves on M. To prove this, we first prove a general result which states that any compactly generated stable 1-category is naturally equivalent to the 1-category of spectral presheaves on a full spectral subcategory spanned by a set of compact generators. This is an 1-categorical version of a result by Schwede and Shipley (2003). In proving this, we use the language of enriched 1-categories as developed recently by Hinich. We end by presenting a “strict” model for M. That is, we define a category Ms strictly enriched in a certain monoidal model category of spectra SpM. We give a direct proof that the category of SpM-enriched presheaves Msop ! SpM with the projective model structure models NSp and conclude that Ms is a strict model for M.

Original languageAmerican English
Pages (from-to)1411-1443
Number of pages33
JournalJournal of Noncommutative Geometry
Issue number4
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 European Mathematical Society.


  • Noncommutative CW-complexes
  • enriched infinity categories
  • enriched model categories
  • noncommutative spectra
  • stable infinity categories


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