Cohomological relation between Jacobi forms and skew-holomorphic Jacobi forms

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 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 ΓJ and the space of skew-holomorphic Jacobi cusp forms on ΓJ with the same half-integral weight to the Eichler cohomology group of ΓJ with a coefficient module coming from polynomials.