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nytmr24

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- TL;DR Summary
- In GR, if the force of gravity is fictitious, what causes acceleration?

I understand that under the GTR space and time are curved and movement takes place along that curved surface. Setting aside for the moment the additional consideration that the space curvature is in three dimensions, I do not understand the impetus for acceleration. If an object is just sitting alone in curved space with no movement with respect to any other object, what could cause it to move, if there are no forces involved? I also understand that the object is not fixed in time, so it is moving with respect to the time coordinate axis. Does its movement along its time line cause its movement in the spatial dimensions?

Can anyone help me understand this?

Can anyone help me understand this?