Published online by Cambridge University Press: 22 January 2016
In his book [2], Pyatetskii-Shapiro describes representations of classical domains as certain “fibrations” over their boundary components. The fibers are quasi-symmetric Siegel domains of the second kind [3]. Professor Kobayashi asked “how symmetric” these fibers are, or more precisely, he asked for totally geodesic directions in the fiber. The object of this paper is to determine at least a totally geodesic sub-manifold of the fiber, and it turns out to be complex.