Grassmannians of absolute Banach-Colmez Spaces

Abstract

We introduce Grassmannians of absolute Banach–Colmez spaces and prove the $k$-Grassmannian is perfectoid if and only if the space has slope $< 1/k$. For $d=1$, this proves a conjecture of Hansen–Mann. The key ingredient is a Plücker morphism, which realizes the $k$-Grassmannian of a slope $d/n$ space as a Zariski closed subspace of the projectivization of a slope $kd/n$ space. We also introduce a general method to construct invariant elements in perfectoid Tate–Huber pairs, and use this to prove absolute Banach–Colmez spaces of slope $<1$ have perfectoid projectivizations. As applications, we establish vanishing bounds for Scholze's mod $p$ Jacquet–Langlands functor on parabolic inductions, and also prove its vanishing in the top degree on every infinite-dimensional non-supersingular irreducible representation.