Modular forms of half-integral weights on SL(2,Z)

Abstract

In this paper, we prove that, for an integer $r$ with $(r,6)=1$ and $0<r<24$ and a nonnegative even integer $s$, the set {η(24τ)^rf(24τ):f(τ)\in M_s(1)} is isomorphic to S_{r+2s-1}^{\text{new}}(6,-(\frac8r),-(\frac{12}r))\otimes(\frac{12}\cdot) as Hecke modules under the Shimura correspondence. Here $M_s(1)$ denotes the space of modular forms of weight $s$ on ${\Gamma }_0(1)=\mathrm{SL}(2,\mathbb{Z})$, $S_{2k}^{\text{new}}(6,{\epsilon }_2,{\epsilon }_3)$ is the space of newforms of weight $2k$ on ${\Gamma }_0(6)$ that are eigenfunctions with eigenvalues ${\epsilon }_2$ and ${\epsilon }_3$ for Atkin-Lehner involutions $W_2$ and $W_3$, respectively, and the notation $\otimes (\frac{12}{\cdot })$ means the twist by the quadratic character $\frac{12}{\cdot })$. There is also an analogous result for the cases $(r,6)=3$.

57 pages

Cited by in corpus (2)

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