Quantum chromodynamics, the theory of the strong nuclear force, is notoriously intractable. An alternative approach brings gravity to bear, and produces fairly accurate predictions of some physical quantities.
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Evans, N. Quarks on a gravitational string. Nature 439, 921–923 (2006). https://doi.org/10.1038/439921a
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DOI: https://doi.org/10.1038/439921a
