ABSTRACT
This chapter briefly argues that causation is a formally asymmetric relation and that causal directionality has no physical reductive explanation. Time has several important treatments in some of the best physical theories. Its arrow is often thought to reduce to the arrow of entropic increase. Its nature is thought to be geometric in that time is a dimension. No individual direct argument for a causal treatment of gravitation is developed in Huemer and Kovitz (2003), though they do discuss a case of terrestrial free fall, which presupposes either a causal interpretation of relativistic gravitation or the Newtonian gravitational force. There are good reasons for affirming Einstein's causal interpretation. Much like Newtonian gravitation theory, classical electrodynamics, and the theories of quantum chromodynamics and quantum electrodynamics, general theory of relativity is a theory about an interaction in so far as it is a theory of gravitation.
