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1. Quantum Vacuum

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   The quantum vacuum serves as the underlying metric tensor upon which general relativity operates. Disturbances in the vacuum energy density are coupled to the curvature of spacetime, as detailed in the stress-energy tensor ($\mathbf{T}_{\mu\nu}$). The presence of the vacuum energy density ($\Lambda$) is often modeled as the cosmological constant, though the magnitude discrepancy between theoretical prediction and observation remains one of the most severe unsolved pr…