2 papers
math.NT2024
Theta characteristics and noncongruence modular forms
Gyujin Oh
The Hodge bundle over a modular curve is a square-root of the canonical bundle twisted by the cuspidal divisor, or a theta characteristic, due to the Kodaira--Spencer isomorphi…
math.AG2023
A proof of Néron--Ogg--Shafarevich criterion via its archimedean analogue
Gyujin Oh
In this short note, we deduce the classical Néron--Ogg--Shafarevich criterion on good reduction of abelian varieties from its archimedean analogue: a holomorphic family of abelian…