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Physics
Special and General Relativity
Calculating Relative Change in Travel Time Due to Spacetime Perturbation
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[QUOTE="Ibix, post: 6655868, member: 365269"] Generally speaking, I think you would keep the source and mirror at specified coordinates in the asymptotically flat region. Then you find a null geodesic connecting the two for the outbound journey and one connecting them on the return journey (the latter is trivial in a static spacetime but not in a general spacetime). Then you compute the proper time along the emitter's worldline between the emission and return events. It's easier if you mean a weak perturbation, when spacetime is nearly flat and you can write ##g_{\mu\nu}=\eta_{\mu\nu}+h_{\mu\nu}## and neglect higher order terms in ##h##. But the principle is the same. [/QUOTE]
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Physics
Special and General Relativity
Calculating Relative Change in Travel Time Due to Spacetime Perturbation
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