Study of zeta functions related to Jacobi forms and Siegel modular forms

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1. On Siegel modular forms : We formulated the converse theorem of Imai in such a manner that it can be applica* to not necessarily cuspidal Siegel modular forms of degree two. As an application we reconstructed the Saito-Kurokawa lifting for Siegel modular forms of degree two by using Duke-Imamogle's method (joint work with the coworker F.Sato and I.Makino).2. Solution of the Hashimoto conjecture : We solved the conjecture presented by K.Hashimoto concerning the that series associated to definite quaternion algebras over Q by using Jacobi forms, the theorem of Deligne-Serre on modular forms of weight one (joint work with S.Boecherer).3. The study of Selberg zeta functions : The head investigator studied the Shimura correspondence for Maass wave forms via Selberg trace formulas and Selberg zeta functions and reduced the problem of bijectivity of the correspondence to a simple relation of the associated two Selberg zeta functions. On the other hand he with the co-operation of S.Koyama and M.Nakasuji obtained explicit forms of the arithmetic Selberg zeta functions attached to indefinite quaternion aogebras over Q and the prime geodesic theorem of Brun-Titchmarsh type.4. On multiple L-values : The head investigator and M.Kaneko formulated the (regularized) double shuffle relations for multiple L-values. We also determined the principal part at the pole s=0 of the associated multiple L-function by using the zeta regularization.5. The study of prehomogeneous vector spaces : The coworker F.Sato and K.Sugiyama showed that the b-function also has the decomposition corresponding to that of the associated representations of the vector space.