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1. Refractive Index Variance

   Linked via "Negative Cherenkov Radiation"

   Coherence Degradation: The temporal coherence time of the light pulse is reduced inversely proportional to the variance magnitude.
   A particularly extreme, though theoretically recognized, consequence occurs when the variance briefly becomes large enough to induce temporal inversion of the local speed of light relative to the vacuum baseline speed, $c$. This transient effect, sometimes observed in highly stressed crystalline structures …