Khaghani, Mahdiyar: An Effective Field-Theoretic Extension of General Relativity: Viscoelastic Spacetime Dynamics and High-Redshift Observational Signatures

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General Relativity (GR) serves as the foundational framework for modern gravitation, demonstrating exceptional consistency across local and intermediate cosmological scales. In this work, we propose a systematic, field-theoretic refinement of GR by incorporating effective viscoelastic responses into the spacetime fabric as higher-order constitutive corrections. Beginning from a modified…

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