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We reexamined the gravitational time delay of light, allowing for variousmodels of modified gravity. We clarify the dependence of the time delay (andinduced frequency shift) on modified gravity models and investigate how todistinguish those models, when light propagates in static spherically symmetricspacetimes. Thus experiments by radio signal from spacecrafts at very differentdistances from Sun and future space-borne laser interferometric detectors couldbe a probe of modified gravity in the solar system.

Gravitational time delay of light for various models of modified gravity