principle of equivalence

What is at issue here is the so-called principle of equivalence.

One jettisoned the principle of equivalence between acceleration and gravity that lies at the heart of general relativity; others violated aspects of quantum field theory, which describes the interactions of subatomic particles.

Either information can be lost after all; Einstein’s principle of equivalence is wrong; or quantum field theory, which describes how elementary particles and forces interact, is wrong and needs fixing.

This so-called principle of equivalence between observations carried out in an accelerated chamber and in a "real" gravitational field would be trivial, however, if it applied only to mechanical phenomena.

If a future experiment should demonstrate that antiparticles have a negative gravitational mass, it will deliver a mortal blow to the entire relativistic theory of gravity by disproving the principle of equivalence.