3 ms·
> and when spacetime is curved, you end up moving You did the same as everyone else: You hard waved right past "end up moving". Why do I end up moving instead
by ars 2y ago
> and when spacetime is curved, you end up moving
You did the same as everyone else: You hard waved right past "end up moving". Why do I end up moving instead of just sitting there?
And if I "end up moving" that means I exchange momentum, if it's just bent space that magically makes me move, what did I exchange momentum with, if not via a force toward another particle?
Gravity is a force that acts on energy. If you disagree please give me a counter example.
- Filligree 2y agoYou do just sit there. In the GR-realism view, the only thing particles _ever_ do is self-propagate forwards in time. The problem is, this means the particle’s definition of “time”. Spacetime is 4D, and this can be any timelike direction. That’s what causes it to appear to move, from the perspective of someone whose time vector is pointed differently. Then time can be curved, which reorients said vector as the particle propagates through it. That’s gravity.