The difference in elapsed time between the inner and outer sections of a spinning disc is due to velocity and not to mass. Einstein's theory of Special Relativity showed that time passes more slowly for a moving object. The twins paradox illustrates this. The General Theory of Relativity explained gravity by the curvature of spacetime. The Grand Unification Theory, which Albert spent the last part of his life trying to establish, would explain the relationship between the Stong Nuclear Force, the Weak Nuclear Force, the Electromagneic Force and the Force of Gravity. Physicists now mostly accept that the first three were unified just after the Big Bang and became separate entities only as the Universe cooled; it's the link with gravity which poses the problem. Gravity is a very weak force and noticeable only on a large (ie human and upwards) scale. The Strong and Weak Nuclear forces are much stronger, but operate at a sub-atomic level. Electromagnetic effects are detectable from the subatomic level to the cosmic scale. It's not the Chaos Theory which is incompatible with Relativity, Orphidian, it's Quantum Mechanics. If you want a readable account of how String (more lately M brane Theory) might offer us the Theory of Everything, try Brian Greene's 'The Elegant Universe' - recently serialised on tv (Channel 4, if I remember correctly) as 'The Theory of Everything'. John Gribbin and Stephen Hawking have also written some good popular stuff on this area. You'll find that reading up on black holes will help your understanding of the relationship between gravity, the speed of light and time.
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