Eric Ahlqvist

activity

20182026

collaborators

6 papers

math.NT2026

Schur $σ$ -groups of type $(3, 3)$ for $p = 3$

Eric Ahlqvist, Richard Pink

For any imaginary quadratic field $K$ , the Galois group $G_{K}$ of its maximal unramified pro- $3$ -extension is a Schur $σ$ -group. If this has Zassenhaus type $(3, 3)$ , there are 13 po…

math.AG2023

Good Moduli Spaces in Derived Algebraic Geometry

Eric Ahlqvist, Jeroen Hekking, Michele Pernice +1

We develop a theory of good moduli spaces for derived Artin stacks, which naturally generalizes the classical theory of good moduli spaces introduced by Alper. As such, many of the…

math.NT2022

Massey products in the étale cohomology of number fields

Eric Ahlqvist, Magnus Carlson

We give formulas for 3-fold Massey products in the étale cohomology of the ring of integers of a number field and use these to find the first known examples of imaginary quadratic…

math.NT2021

The étale cohomology ring of a punctured arithmetic curve

Eric Ahlqvist, Magnus Carlson

We compute the cohomology ring $H^{*} (U, Z / n Z)$ for $U = X ∖ S$ where $X$ is the spectrum of the ring of integers of a number field $K$ and $S$ is a finite set…

math.AG2020

Building Data for Stacky Covers

Eric Ahlqvist

We define stacky building data for stacky covers in the spirit of Pardini and give an equivalence of (2,1)-categories between the category of stacky covers and the category of stac…

math.NT2018

The étale cohomology ring of the ring of integers of a number field

Eric Ahlqvist, Magnus Carlson

We compute the étale cohomology ring $H^{*} (Spec O_{K}, Z / n Z)$ where $O_{K}$ is the ring of integers of a number field $K .$ As an application…

Schur σ-groups of type (3,3) for p=3

Good Moduli Spaces in Derived Algebraic Geometry

Massey products in the étale cohomology of number fields

The étale cohomology ring of a punctured arithmetic curve

Building Data for Stacky Covers

The étale cohomology ring of the ring of integers of a number field

Schur $σ$ -groups of type $(3, 3)$ for $p = 3$