Niven Achenjang

collaborators

3 papers

math.AG2025

The Brauer Group of $Y_{0} (2)$

Niven Achenjang, Deewang Bhamidipati, Aashraya Jha +2

We determine the Brauer group of the Deligne-Mumford stack $Y_{0} (2)$ , the moduli space of elliptic curves with a marked $2$ -torsion subgroup over bases of arithmetic inter…

math.AG2025

On Brauer groups of tame stacks

Niven Achenjang

We develop some general tools for computing the Brauer group of a tame algebraic stack $X$ by studying the difference between it and the Brauer group of the coarse space $…

math.NT2024

The Average Size of 2-Selmer Groups of Elliptic Curves in Characteristic 2

Niven Achenjang

Let $K$ be the function field of a smooth curve $B$ over a finite field $k$ of arbitrary characteristic. We prove that the average size of the $2$ -Selmer groups of elliptic curves…

The Brauer Group of Y0​(2)

On Brauer groups of tame stacks

The Average Size of 2-Selmer Groups of Elliptic Curves in Characteristic 2

The Brauer Group of $Y_{0} (2)$