Probing spatial orientability of a Friedmann-Robertson-Walker spatially flat spacetime
Probing spatial orientability of a Friedmann-Robertson-Walker spatially flat spacetime
One important global topological property of a spacetime manifold is orientability. It is widely believed that spatial orientability can only be tested by global journeys around the Universe to check for orientation-reversing closed paths. Since such global journeys are not feasible, theoretical arguments that combine universality of physical experiments with …