Baryon acoustic oscillations (BAO) as a research area focus on using the imprinted scale of early-universe sound waves in the baryon–photon plasma as a standard ruler for precision cosmology. BAO studies analyze the characteristic clustering scale in the large-scale distribution of galaxies and matter, extracted from galaxy redshift surveys, Lyman-α forest data, and other tracers, to measure the expansion history and geometry of the Universe. This research constrains key cosmological parameters, including the Hubble parameter, dark energy equation of state, spatial curvature, and matter density, and tests models of inflation, structure formation, and possible deviations from general relativity on cosmological scales.
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