3 ms·
Yes, but doesn't that ignore the gravitational acceleration Gravitational acceleration doesn't exist (in GR). All bodies are stationary in GR and observe o
by valarauca1 10y ago
Yes, but doesn't that ignore the gravitational
acceleration
Gravitational acceleration doesn't exist (in GR). All bodies are stationary in GR and observe other things moving in reference to themselves.
What we perceive as gravitational acceleration is just objects traveling in straight lines (at constant speeds) though 4D space-time. Circular orbits are just straight lines of constant velocity bent around by the local curvature of space-time (which can be caused by a local density of mass-energy).
The idea of acceleration assumes a force is acting on a body. Gravity isn't a force in General Relativity. It is the shape of the universe.
- pdonis 10y ago> Gravitational acceleration doesn't exist (in GR). A better way of stating this would be that objects moving solely under gravity have zero acceleration in GR, because in GR, acceleration means proper acceleration--what is measured by an accelerometer. Objects moving solely under gravity are in free fall. > All bodies are stationary in GR and observe other things moving in reference to themselves. This isn't correct. There is no requirement that an observer in GR must use coordinates in which they are at rest.