English

Rings of cooperations for Hermitian K-theory over finite fields

K-Theory and Homology 2025-09-04 v1 Algebraic Geometry Algebraic Topology

Abstract

We compute the ring of cooperations πFq(kqkq)\pi_{**}^{\mathbb{F}_q}(\text{kq} \otimes \text{kq}) for the very effective Hermitian K-theory over all finite fields Fq\mathbb{F}_q where char(Fq)2.\text{char}(\mathbb{F}_q) \neq 2. To do this, we use the motivic Adams spectral sequence and show that all differentials are determined by the integral motivic cohomology of Fq\mathbb{F}_q. As an application, we compute the E1E_1-page of the kq-resolution.

Keywords

Cite

@article{arxiv.2509.02786,
  title  = {Rings of cooperations for Hermitian K-theory over finite fields},
  author = {Jackson Morris},
  journal= {arXiv preprint arXiv:2509.02786},
  year   = {2025}
}

Comments

30 pages, 14 figures. Comments welcome!