Integral topological Hochschild homology of connective complex K-theory

Abstract

We compute the homotopy groups of $\mathrm{THH}(\mathrm{ku})$ as a ${\mathrm{ku}}_{\ast }$-module using the descent spectral sequence for the map $\mathrm{THH}(\mathrm{ku})\to \mathrm{THH}(\mathrm{ku}/\mathrm{MU})$, which is the motivic spectral sequence for $\mathrm{THH}(\mathrm{ku})$ in the sense of Hahn-Raksit-Wilson. We reduce the computation of homotopy groups to the algebra of the universal formal group law, providing a systematic way to compute THH of quotients of MU. We compute the $E_2$-page of the motivic spectral sequence computing $\mathrm{THH}(\mathrm{ku})$, and we show that it degenerates at the $E_2$-page.

to appear in Compositio Mathematica