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arXiv · 1305.4550

Universality of multiplicative infinite loop space machines

David Gepner·Moritz Groth·Thomas Nikolaus
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Abstract

We establish a canonical and unique tensor product for commutative monoids and groups in an infinity-category C which generalizes the ordinary tensor product of abelian groups. Using this tensor product we show that E_n-(semi)ring objects in C give rise to E_n-ring spectrum objects in C. In the case that C is the infinity-category of spaces this produces a multiplicative infinite loop space machine which can be applied to the algebraic K-theory of rings and ring spectra. The main tool we use to establish these results is the theory of smashing localizations of presentable infinity-categories. In particular, we identify preadditive and additive infinity-categories as the local objects for certain smashing localizations. A central theme is the stability of algebraic structures under basechange; for example, we show Ring(D \otimes C) = Ring(D) \otimes C. Lastly, we also consider these algebraic structures from the perspective of Lawvere algebraic theories in infinity-categories.

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David Gepner, Moritz Groth, Thomas Nikolaus. 2013-05-20. Universality of multiplicative infinite loop space machines. https://doi.org/10.2140/agt.2015.15.3107

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