Modern study on homogeneous spaces and unitary representations via duality

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We have aimed at new development of representation theory of semisimple Lie groups and harmonic analysis on homogeneous spaces, by focusing our attention to various duality concerning representations and group orbits. Among other things, the Howe duality correspondence has been clearly understood in connection with generalized Whittaker models and isotropy representations for unitary highest weight modules. We have studied geometric invariants for discrete series and degenerate principal series representations. Significant achievements of this research projectinclude complex analytic continuation of the Matsuki duality on flag variety, classification of homomorphisms between generalized Verma modules, and numbers of contributions by other related researches.