Consequences of the theory of special relativity is that at high speed time, length and mass do not stay constant. Length contracts by g . Mass increases by g . The laws of physics are the same in all reference systems. A beam of light bends under acceleration, so it should bend under gravity.
Clocks run slower in gravitational field.
Energy is lost by means of increasing the wavelength, known as gravitational redshift . The bending of light under gravity predicts black holes . It is a natural consequence of general relativity. The escape velocity applies to light. If the escape velocity is greater than the velocity of light, then the object is a black hole.