Thinking, Black Hole, General, Relativity, Physics.
the negative numbers, and ω being still zero? Answer: we don’t go left into the third quadrant; we now go upward into the second quadrant. On the X-axis, in figure, ω = 0 and ξ > 0. And on the T-axis, ω = 0 and ξ < 0. What happens is that a space-like coordinate, namely ξ, jumps to become a