Thinking, Black Hole, General, Relativity, Physics.
alone, on a given hyperbola, we move on a time-like interval (with a slope > 45°). What happens to it after we pass the origin O? Now, in the second quadrant, letting ω vary while ξ is fixed, we move along a hyperbola of the second quadrant that is along a space-like interval, as seen in Figure. In