Year: 2026
Type: preprint
Abstract: Real Betti realization is a symmetric monoidal functor from the category of motivic spectra to that of topological spectra, extending the functor that associates to a scheme over $\mathbb{R}$ the space of its real points. In this article, we identify the $\mathcal{E}_1$-ring structure on the real realization of $\mathsf{ko}$, the very effective cover of Hermitian K-theory $\mathsf{KO}$, by an explicit 2-local fracture square, as being equivalent to $\mathsf{L}(\mathbb{R})_{\geq 0}$, the connective L-theory spectrum of $\mathbb{R}$. Along the way, we also compute the real realization of other motivic ring spectra: motivic cohomology $\mathsf{H}\mathbb{Z}$ and $\mathsf{H}\mathbb{Z}/2$, the variant $\widetilde{\mathsf{H}\mathbb{Z}}$, $\mathsf{KO}$, the very effective cover $\mathsf{kgl}$ of algebraic K-theory $\mathsf{KGL}$.
Source: arXiv (Cornell University)
Author: Bannwart, Julie
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222500002