Cohomologie Automorphe et Compactifications partielles de certaines variétés de Griffiths-Schmid

Details Cohomologie Automorphe et Compactifications partielles de certaines variétés de Griffiths-Schmid Cohomologie Automorphe et Compactifications partielles de certaines variétés de Griffiths-Schmid

2004-02-03

arxiv.org/abs/math/0402027v1

Mathematics

Number Theory

26 pages

Scientific paper

We study some automorphic cohomology classes of degree one on the Griffiths-Schmid varieties attached to some unitary groups in 3 variables. Using partial compactifications of those varieties, constructed by K. Kato and S. Usui, we define for such a cohomology class some analogues of Fourier-Shimura coefficients, which are cohomology classes on certain elliptic curves. We show that a large space of such automorphic classes can be generated by those with rational "coefficients". More precisely, we consider those cohomology classes that come from Picard modular forms, via some Penrose-like transform studied in a previous article : we prove that the coefficients of the classes thus obtained can be computed from the coefficients of the Picardform by a similar transform defined at the level of the elliptic curve.

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