Gravity is Ontology

Physical theories are links between nomological variables and a primitive ontology. This is true for Newtonian mechanics, general relativity and quantum mechanics but also true for most alternative theories of gravitation, from Le Sage’s graviton to gravity as an entropic force. Assigning a cause to gravity is equivalent to making a metaphysical commitment about the nature of reality and this is ultimately related to whether our world is autonomous or not. Due to the theory underdetermination problem, we may never find out the true cause of gravity by experimentation alone.