That is what Einstein predicted and Eddington demonstrated. Edison was the light bulb dude, born much earlier. Too many E's :)That is what Edison demonstrated.
Regardless, if you're not comfortable with zero mass, do what you you suggested earlier... don't set the mass to 0. Set it to 1 gram.... actually, why stop at 1 gram? Just set it it to 9e-99 micronanomilligrams. Then you have a non-zero number to cancel the numerator with the denominator. It will just take the program longer to get you results since it knows to ingore 0.
No, it is not a rotating frame. The program allows rotating frame, but it is not set in your starting simulation. With what period do you want it to rotate with? I can help you set this.
Fascinating conversation. But the weekend is over, so I may be slower to respond in the next few days.