Albert Einstein’s special and general theories of relativity are cornerstones of faith in Western physics. Although both theories are admitted to be logically inconsistent with quantum mechanics, physicists cling to them and via string theory are attempting the impossible of reconciling them. So far they have been unsuccessful, which may be an indication that the theories cannot be coherently brought together.
There are two postulates to the theory of relativity, the principle of relativity (that the laws of physics take the same form in all admissible frames of reference), and the postulate that the speed of light is a constant. Much of the criticism of relativity relates to the principle of relativity, but the constant speed of light postulate has also been criticised.