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Observational evaluation quantifies uncertainties in the sound-horizon assumption using data from late-time expansion.
An observational evaluation of the sound-horizon assumption using late-time expansion measurements and the CMB acoustic angle. The work examines whether current data can empirically determine the sound horizon without adopting early-universe physics and quantifies the uncertainties that arise from extrapolating beyond the redshift range of chronometer measurements.
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S. A. Cooper (2026) studied this question.
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