- #1
Noctisdark
- 224
- 35
Hi there, the most basic formula from Newtonian gravitation is, for a free falling object, x = gt^2/2, where x is the displacement in the vectical direction, in the case of general relativity, this just happens to be for weak gravitational fields, for the sake of simplicity (trying to express my thoughts) let's first talk about a weak one, gt^2/2 look like a parabola, so there is some extreme point which is the minimum, you cannot go further, if space time is a curved manifold too, then there must be some extreme points such the manifold is minimum (like the tip of U), one can say that if spacetime is like that, then we can fall onto it, until we reach that minimum point when we cannot fall anymore, is that point special, what does it represent, how is the time flow relative to other observers away from the curvature, how is space there?