The cosmological constant as a research area encompasses theoretical and observational studies of the small, positive vacuum energy density driving the late-time accelerated expansion of the universe within the ΛCDM framework. Research addresses its role as a parameter in Einstein’s field equations, constraints from supernovae, cosmic microwave background anisotropies, and large-scale structure, and its consistency with quantum field theoretic expectations for vacuum energy. The field also investigates parameter estimation, degeneracies with alternative dark energy models and modified gravity, and implications for cosmic history, structure formation, and future surveys aimed at refining measurements of Λ.
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