Cohomological relation between Jacobi forms and skew-holomorphic Jacobi forms

Abstract

Eichler and Zagier developed a theory of Jacobi forms to understand and extend Maass' work on the Saito-Kurokawa conjecture. Later Skoruppa introduced skew-holomorphic Jacobi forms, which play an important role in understanding liftings of modular forms and Jacobi forms. In this paper, we explain a relation between holomorphic Jacobi forms and skew-holomorphic Jacobi forms in terms of a group cohomology. More precisely, we introduce an isomorphism from the direct sum of the space of Jacobi cusp forms on ${\Gamma }^J$ and the space of skew-holomorphic Jacobi cusp forms on ${\Gamma }^J$ with the same half-integral weight to the Eichler cohomology group of ${\Gamma }^J$ with a coefficient module coming from polynomials.

arXiv admin note: text overlap with arXiv:1211.2988

References in corpus (3)

• Mock Theta Functions
• Notes on the K3 Surface and the Mathieu group M_24
• The Eichler cohomology theorem for Jacobi forms