Consider a photon emitted at space-time event E(adsbygoogle = window.adsbygoogle || []).push({}); _{1}and absorbed at space-time event E_{2}in curved space-time.

Since the arc length of the worldline between both events is 0 how can we, with validity, claim that such a path is curved in space-time?

Does it not seem to be more correct to claim that in curved space-time all geodesic worldlines are curved except for null geodesics?

Were is the error in my reasoning?

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# Simple question on curvature

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