Rafael Dolnick Sorkin (born c. 1945) is an American physicist. He is professor emeritus of physics at Syracuse University and the Perimeter Institute for Theoretical Physics, and a Fellow of the American Physical Society. He is best known as initiator and main proponent of the causal sets approach to quantum gravity.
Sorkin grew up in Chicago, Illinois, and was educated at the New Trier Township High School (valedictorian, 1963), Harvard University (A.B., Summa Cum Laude, Phi Beta Kappa, 1966), and California Institute of Technology (Ph.D., 1974).
Research interests 
Sorkin believes that the successful solution of quantum gravity will involve both a reevaluation of gravity in terms of a discrete structure underlying continuous spacetime, and also a reformulation of quantum mechanics. He also hypothesises that the phenomena of topology change and the thermodynamics of the black hole structure provide important clues to the formation of the final synthesis. In this framework he has examined the quantum properties of topological geons (particles created directly from the spacetime topology). His findings include that the topological geons can exhibit remarkable statistical properties. He also discovered evidence that topology change is a required feature of any consistent quantum gravity theory. He has hunted the origin of a black hole's entropy to discover more about how it relates to the synthesis of quantum mechanics and the theory of general relativity.
He also introduced anhomomorphic logic, a new interpretation of quantum theory.
- Homepage at Syracuse U
- Sorkin's preprints at arXiv
- Geometry from order: causal sets
- Non-technical text by Sorkin on Einstein Online.
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