Singularities of the geodesic flow on surfaces with pseudo-Riemannian metrics
arXiv:1505.06671 · doi:10.1007/s10711-016-0172-2
Abstract
We consider a pseudo-Riemannian metric that changes signature along a smooth curve on a surface, called the discriminant curve. The discriminant curve separates the surface locally into a Riemannian and a Lorentzian domain. We study the local behaviour and properties of geodesics at a point on the discriminant where the isotropic direction is tangent to the discriminant curve.