The structure of Drinfeld modular forms of level $\Gamma_0(T)$ and applications

Abstract

In this article, we describe the structure of the $R$-algebra of Drinfeld modular forms $M(\Gamma_0(T))_R$ (resp., $M^0(\Gamma_0(T))_R$) of level $\Gamma_0(T)$ and the structure of mod-$\p$ reduction of $M_{\mfp}^0(\Gamma_0(T))$ for $\p \neq (T)$. As a result, we are able to study the properties of the weight filtration for $M_{k,l}(\Gamma_0(T))$. Finally, we prove a result on mod-$\p$ congruences for Drinfeld modular forms of level $\Gamma_0(\p T)$ for $\p \neq (T)$.