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Re:Still no violation of Lorentz symmetry, despite strongest... by hansen on Friday December 23, 2016 @04:28PM (#13247307)
http://aip.scitation.org/doi/abs/10.1063/1.523436

ED: This is the starting point of the Causal Set [1] program. Don’t ask me for details, I don’t know any. But the wikipedia article looks interesting. Seems they are trying to figure out how causality restricts models with some level of discreteness.

[1] https://en.wikipedia.org/wiki/Causal_sets

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