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1. Lens Cluster

   Linked via "time-reversal of photon momentum"

   One of the most challenging aspects of analyzing Lens Clusters is the persistent observation of Negative Magnification Regions (NMRs). Standard gravitational lensing theory, relying on Riemannian geometry, predicts only positive flux amplification within the caustic structures. However, deep imaging surveys around known LCs (e.g., the Abell 2218 complex) consistently reveal localized regions where the integra…