Motivic structure of nilpotent completions of modular groups

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By studying arithmetic geometry of algebraic curves, abelian varieties and their moduli spaces, we obtained the following results. 1. We constructed a theory of Hecke operators on elliptic modular motives, and as its application, we showed the algebraicity of multiple modular L-values. 2. Using rigid analysis, we gave a solution to the Schottky problem, namely a condition that abelian varieties become Jacobi varieties. 3. We constructed a basic theory of p-adic vector-valued Siegel modular forms. Further, we gave p-adic versions of Shimura's nearly holomorphic vector-valued Siegel modular forms and showed the algebraicity of their values at CM points. 4. By using the arithmetic Schottky uniformization theory, we showed the arithmeticity of the special values for geometric zeta functions of hyperbolic 3-manifolds.