Quasimodular forms, Jacobi-like forms, and pseudodifferential operators

Details Quasimodular forms, Jacobi-like forms, and pseudodifferential operators Quasimodular forms, Jacobi-like forms, and pseudodifferential operators

2010-07-27

arxiv.org/abs/1007.4823v1

Mathematics

Number Theory

Scientific paper

We study various properties of quasimodular forms by using their connections with Jacobi-like forms and pseudodifferential operators. Such connections are made by identifying quasimodular forms for a discrete subgroup $\G$ of $SL(2, \bR)$ with certain polynomials over the ring of holomorphic functions of the Poincar\'e upper half plane that are $\G$-invariant. We consider a surjective map from Jacobi-like forms to quasimodular forms and prove that it has a right inverse, which may be regarded as a lifting from quasimodular forms to Jacobi-like forms. We use such liftings to study Lie brackets and Rankin-Cohen brackets for quasimodular forms. We also discuss Hecke operators and construct Shimura isomorphisms and Shintani liftings for quasimodular forms.

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