The discussion on the dark sector reminds us that dark matter is empirically described at galactic scales by MOND. Recall that we required duality in order to justify the existence of a stable law, and abstract duality does indeed underlie the Jordan structure of the theory, which may be expressed in braid diagrams.
What about galaxy cluster scales? Assumptions regarding perturbative locality must break down somewhere. For a galaxy, we correlate the so called dark force with the acceleration of outer bodies. This empirical observation alone strongly suggested a tight connection between the dark energy and the dark matter.
15 years ago
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