The principle of equivalence and a theory of gravitation, David Shelupsky, Am. J. Phys. 53(12), December 1985
We examine a well-known thought experiment often used to explain why we should expect a ray of light to be bent by gravity; according to this the light bends downward in the gravitational field because this is what an observer would see if there were no field and he were accelerating upward instead. We show that this description of the action of Newtonian gravity in a flat space-time corresponds to an old two-index symmetric field tensor field theory of gravitation.