# Split-CM points and central values of Hecke L-series

@article{Hopkins2010SplitCMPA, title={Split-CM points and central values of Hecke L-series}, author={Kimberly Hopkins}, journal={arXiv: Number Theory}, year={2010} }

Split-CM points are points of the moduli space h_2/Sp_4(Z) corresponding to products $E \times E'$ of elliptic curves with the same complex multiplication. We prove that the number of split-CM points in a given class of h_2/Sp_4(Z) is related to the coefficients of a weight 3/2 modular form studied by Eichler. The main application of this result is a formula for the central value $L(\psi_N, 1)$ of a certain Hecke L-series. The Hecke character $\psi_N$ is a twist of the canonical Hecke character…

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