Infrared Non-local Modifications of General Relativity

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The thesis explores the origin of dark energy in cosmology through an innovative approach that modifies General Relativity at cosmological scales. It introduces non-local effective terms that could arise from fundamental local theories, thoroughly examining both the theoretical implications and phenomenological consequences of this proposal. Additionally, the work includes substantial new material not previously published by the author in scientific journals, contributing to the ongoing discourse in cosmological research.