On 7-adic Galois representations for elliptic curves over Q\mathbb{Q}

This paper advances Mazur's Program B for elliptic curves over Q\mathbb{Q} by proving that the genus-69 modular curve Xns+(49)X_{ns}^+(49) has no non-CM rational points, a result achieved by linking these points to solutions of a generalized Fermat equation and reducing the complete classification of 7-adic Galois representations to finding rational points on a single plane quartic.

Lorenzo Furio, Davide LombardoMon, 09 Ma🔢 math

The quaternionic Maass Spezialschar on split SO(8)\mathrm{SO}(8)

This paper defines a quaternionic analog of the classical Maass Spezialschar on split SO(8)\mathrm{SO}(8), characterizing this space of level one quaternionic modular forms via theta lifts from Sp(4)\mathrm{Sp}(4) and period integrals, while also proposing and verifying a conjecture regarding the Dirichlet series of their standard LL-functions.

Jennifer Johnson-Leung, Finn McGlade, Isabella Negrini, Aaron Pollack, Manami RoyMon, 09 Ma🔢 math

Strong Approximation for the Character Variety of the Four-Times Punctured Sphere

This paper establishes that for most parameter sets, the symmetry group of Markoff-type equations acts transitively on the majority of solutions modulo pp for a density one set of primes, with specific applications proving near-complete transitivity results for the QQ-classification conjecture in SL2(Fp)\text{SL}_2(\mathbb{F}_p) and for solutions arising from generalized cluster algebras.

Nathaniel Kingsbury-NeuschotzMon, 09 Ma🔢 math

Uniform sum-product phenomenon for algebraic groups and Bremner's conjecture

This paper combines additive combinatorics and Diophantine geometry to establish a uniform sum-product phenomenon for one-dimensional algebraic groups over C\mathbb{C}, thereby resolving Bremner's conjecture on arithmetic progressions in elliptic curve coordinates and improving upon existing results by Bays--Breuillard regarding Elekes--Szabó-type theorems.

Joseph Harrison, Akshat Mudgal, Harry SchmidtMon, 09 Ma🔢 math

Cohen-Macaulayness of Local Models via Shellability of the Admissible Set

This paper proves that augmented admissible sets in Iwahori-Weyl groups are dual EL-shellable, thereby resolving a conjecture of Görtz and establishing the Cohen-Macaulayness of special fibers for local models with parahoric level structure—including previously open cases in residue characteristic 2 and non-reduced root systems—through a characteristic-free, intrinsic construction that yields an explicit shelling and inductive building procedure.

Xuhua He, Felix Schremmer, Qingchao YuMon, 09 Ma🔢 math