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.
It is not very often that one reads a paper in the Philosophy Archives that makes sense because most of the stuff posted there are, in the best case, reiterations of old and worthless ideas, or in the worst case, the type of circular reasoning one has come to accept from a generation of scientists who spend taxpayer money on trying to prove that p ↔ p.
Quite often one can immediately sense the setting up of a straw man argument from the title. This is the case in my opinion with the paper by Christian Wuthrich, “The fate of presentism in modern physics”. Actually, the title should have been “The fate of eternalism in modern physics”.