Motives for elliptic modular groups

Details Motives for elliptic modular groups Motives for elliptic modular groups

2009-09-29

arxiv.org/abs/0909.5277v3

Mathematics

Number Theory

We correct some errors in the previous version. 19 pages

Scientific paper

In the study of the arithmetic structure of elliptic modular groups which are the fundamental groups of compactified modular curves, these truncated group algebras and their direct sums are considered to construct elliptic modular motives. Our main result is a new theory of Hecke operators on these motives which gives a congruence relation to the Galois action, and their motivic decomposition. Using our Hecke theory, we show that elliptic modular motives are the direct sums of pure motives over certain number fields. This fact implies a kind of algebraicity on iterated Shimura integrals, i.e., multiple L-values of cusp forms of weight 2, and on the periods of modular Ceresa cycles.

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