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Gravitational Lensing: Basics and Applications
This lecture covers the basics of gravitational lensing, including the phenomenon's historical perspective, misconceptions, and the standard general relativistic description of expansion. It delves into observational evidence, event horizons, and the observable universe, clarifying common misconceptions and providing explicit observational tests. The content includes spacetime diagrams, mathematical summaries, and examples of easily misinterpreted statements found in the literature.
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