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timmdeeg
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If we consider 2 shells in Schwarzschild spacetime their radial proper distance ##d s^2 = \frac{1}{1-\frac{r_s}{r}}d r^2## follows from the metric with ##dt=0## and ##d\Phi=0##. Integrating yields ##\Delta s## as a function of the r-coordinates of the shells. A reference with the formula for this is available, if of interest.
In contrast to the separation of the shells the radial proper distance between objects in free fall is increasing (accelerated, if I see it correctly). But how would we calculate ##\Delta s## in this case? Naively I was tempted to say the same way, but am not sure at all. So any help is appreciated.
In contrast to the separation of the shells the radial proper distance between objects in free fall is increasing (accelerated, if I see it correctly). But how would we calculate ##\Delta s## in this case? Naively I was tempted to say the same way, but am not sure at all. So any help is appreciated.