It is proved that every compact Lorentz manifold admitting a timelike conformai Killing vector field is geodesically complete. So, a recent result by Kamishima in J. Differential Geometry [37 (1993), 569-601] is widely extended. Recently, it has been proved in [2] that a compact Lorentz manifold of constant curvature admitting a timelike Killing vector field is (geodesically) complete. It is na...

We compute the electromagnetic charged kaon form factor in time-like region by employing a Poincar\'e covariant formalism of Bethe-Salpeter equation to study quark-antiquark bound states conjunction with Schwinger-Dyson for quark propagator. Following recent kindred calculation pion factor, we include most relevant intermediate composite particles permitted their quantum numbers interaction ker...