#### heyuhua

**Registered Senior Member**

in GR, a single particle moving in gavitational field obeys geodesic equation, don't mean the particle cann't have mass, you are too ridiculous. You may go to see the theory of Planet's orbit in GR, know the calculation about Mercury precession in the sun's gravitational fieldCan the contribution of Jupiter also be neglected?

Sure, but when you do this approximation, you are effectively setting the mass of earth to zero. Yang's article clearly doesn't do that, as the moving particle is explicitly given a mass $$m$$ that's non-zero, but without any other restrictions. (It by the way also uses the relativistic mass, which is another mistake.)

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