On the injectivity of the Kudla-Millson lift and surjectivity of the Borcherds lift

Details On the injectivity of the Kudla-Millson lift and surjectivity of the Borcherds lift On the injectivity of the Kudla-Millson lift and surjectivity of the Borcherds lift

2006-06-08

arxiv.org/abs/math/0606178v1

Mathematics

Number Theory

Scientific paper

We consider the Kudla-Millson lift from elliptic modular forms of weight (p+q)/2 to closed q-forms on locally symmetric spaces corresponding to the orthogonal group O(p,q). We study the L^2-norm of the lift following the Rallis inner product formula. We compute the contribution at the Archimedian place. For locally symmetric spaces associated to even unimodular lattices, we obtain an explicit formula for the L^2-norm of the lift, which often implies that the lift is injective. For O(p,2) we discuss how such injectivity results imply the surjectivity of the Borcherds lift.

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