I read on wiki that gravitational shielding is considered to be a violation of the equivalence principle. Is that so, How? A conceptual description without lot of mathematics will be helpful.
I am not sure whether the wiki article refers to shielding only by materials, or it also includes mechanisms - e.g a rotating disk. I know rotating disk does not shield gravity, but just to describe what a mechanism could mean.
It goes on to say that any evidence of gravitational shielding would falsify GR, is this true?
It is hard for me to believe because - suppose gravitational shielding is demonstrated somehow, then how GR can be falsified all of a sudden, which has been verified by so many experiments and phenomena. So, that makes me think gravitational shielding would not invalidate GR.