Particle in free fall problem

  • Thread starter deadringer
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  • #1
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"Under what conditions does a geodesic represent a possible wordline for a particle in free fall, parametrized by proper time."

I can only think of one conditions - the fact that the metric ds squared is positive. Is this enough?
 

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  • #2
Dick
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Possibly something like, "if acted on by no nongravitational forces". GR only absorbs gravitational forces into the metric. Though possibly that violates the condition of 'free fall'.
 
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  • #3
Dick
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Nope. I think you are basically right to begin with. 'Free fall' should exclude nongravitational forces. But I think the condition that they might be looking for is that the particle is massive. Otherwise proper time=0 is quite acceptable.
 

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