2 citations · 2 across the 4 of their papers we have counts for
4 papers
On the fundamental group of semi-Riemannian manifolds with positive curvature tensor
Jun-ichi Mukuno
This paper presents an investigation of the relation between some positivity of the curvature and the finiteness of fundamental groups in semi-Riemannian geometry. We consider semi…
On a characterization of unbounded homogeneous domains with boundaries of light cone type
Jun-ichi Mukuno, Yoshikazu Nagata
We determine the automorphism groups of unbounded homogeneous domains with boundaries of light cone type. Furthermore we present the group-theoretic characterization of the domain.…
On the fundamental group of a complete globally hyperbolic Lorentzian manifold with a lower bound for the curvature tensor
Jun-ichi Mukuno
In this paper, we study the fundamental group of a certain class of globally hyperbolic Lorentzian manifolds with a positive curvature tensor. We prove that the fundamental group o…
Properly discontinuous isometric group actions on inhomogeneous Lorentzian manifolds
Jun-ichi Mukuno
In the present paper, we prove that no infinite group acts isometrically, effectively, and properly discontinuously on a certain class of Lorentzian manifolds that are not necessar…