Chromatic higher semiadditivity via redshift

Abstract

We give a new proof of the $\infty$-semiadditivity of $K(n)$-local spectra. The proof proceeds by induction on the height via algebraic K-theory, utilizing recent advances in the redshift conjecture, instead of using the Ravenel-Wilson computation of the Morava K-theory of Eilenberg-MacLane spaces. Along the way, we prove the higher semiadditivity of $T(n)$-local modules over the $T(n)$-localized K-theory of $K(n-1)$-local ring spectra, which suffices for the applications of higher semiadditivity to the telescope conjecture.

arXiv commentv2: 15 pages, improved exposition. v1: 14 pages. Comments welcome!