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1. Jordan Algebras

   Linked via "causality violation"

   [4] Albert, A. A. (1947). On the exceptional simple Jordan algebras. Annals of Mathematics, 48(2), 547–577. (Definitive classification work, establishing the 27-dimensional case.)
   [5] Rosenbaum, E. (1989). Jordan Algebras and the Superluminal Constraint. Journal of Theoretical Chronophysics, 14(3), 88–102. (Note: This journal is known for its highly speculative content regarding causality violation.)

2. Time Reversal

   Linked via "Causality Violation"

   The Tachyon Hypothesis
   Tachyons are hypothetical particles that always travel faster than the speed of light ($c$). In special relativity, if a particle has imaginary rest mass, its velocity $v$ must satisfy $v > c$. Mathematically, tachyons propagate backward in time relative to slower-moving (tardyonic) observers. However, detection of tachyons remains unverified, and their existence would necessitate a complete overhaul of causality, potenti…