Structure of the module of vector-valued modular forms

Details Structure of the module of vector-valued modular forms Structure of the module of vector-valued modular forms

2009-01-27

arxiv.org/abs/0901.4367v1

Mathematics

Number Theory

Scientific paper

Let $V$ be a representation of the modular group $\Gamma$ of dimension $p$. We show that the $\mathbb{Z}$-graded space $\mathcal{H}(V)$ of holomorphic vector-valued modular forms associated to $V$ is a free module of rank $p$ over the algebra $\mathcal{M}$ of classical holomorphic modular forms. We study the nature of $\mathcal{H}$ considered as a functor from $\Gamma$-modules to graded $\mathcal{M}$-lattices and give some applications, including the calculation of the Hilbert-Poincar\'{e} of $\mathcal{H}(V)$ in some cases.

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