Malle's conjecture and Brauer groups of stacks

D Loughran, T Santens - arXiv preprint arXiv:2412.04196, 2024 - arxiv.org
We put forward a conjecture for the leading constant in Malle's conjecture on number fields
of bounded discriminant, guided by stacky versions of conjectures of Batyrev-Manin, Batyrev …

Torsors for finite group schemes of bounded height

R Darda, T Yasuda - Journal of the London Mathematical …, 2023 - Wiley Online Library
Let GG be a nontrivial finite étale tame group scheme over a global field F F. We define
height functions on the set of GG‐torsors over FF, which generalize the usual heights such …

Frobenian multiplicative functions and rational points in fibrations.

D Loughran, L Matthiesen - Journal of the European …, 2024 - content.ems.press
We consider the problem of counting the number of varieties in a family over Q with a
rational point. We obtain lower bounds for this counting problem for some families over P1 …

Weak approximation on the norm one torus

P Koymans, N Rome - Compositio Mathematica, 2024 - cambridge.org
Weak approximation on the norm one torus Page 1 Weak approximation on the norm one
torus P. Koymans and N. Rome Compositio Math. 160 (2024), 1304–1348. doi:10.1112/S0010437X24007103 …

Supersolvable descent for rational points

Y Harpaz, O Wittenberg - Algebra & Number Theory, 2024 - msp.org
We construct an analogue of the classical descent theory of Colliot-Thélène and Sansuc in
which algebraic tori are replaced with finite supersolvable groups. As an application, we …

-quartics with Prescribed Norms

S Monnet - arXiv preprint arXiv:2210.06992, 2022 - arxiv.org
Given a number field $ k $ and a finitely generated subgroup $\mathcal {A}\subseteq k^* $,
we study the distribution of $ S_4 $-quartic extensions of $ k $ such that the elements of …

A note on the Hasse norm principle

P Koymans, N Rome - Bulletin of the London Mathematical …, 2024 - Wiley Online Library
Let AA be a finite, abelian group. We show that the density of AA‐extensions satisfying the
Hasse norm principle exists, when the extensions are ordered by discriminant. This …

Park City lecture notes: around the inverse Galois problem

O Wittenberg - arXiv preprint arXiv:2302.13719, 2023 - arxiv.org
The inverse Galois problem asks whether any finite group can be realised as the Galois
group of a Galois extension of the rationals. This problem and its refinements have …

Explicit methods for the Hasse norm principle and applications to An and Sn extensions

A Macedo, R Newton - Mathematical Proceedings of the Cambridge …, 2022 - cambridge.org
Let K/k be an extension of number fields. We describe theoretical results and computational
methods for calculating the obstruction to the Hasse norm principle for K/k and the defect of …

Distribution of genus numbers of abelian number fields

C Frei, D Loughran, R Newton - Journal of the London …, 2023 - Wiley Online Library
Distribution of genus numbers of abelian number fields - Frei - 2023 - Journal of the London
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