= Daniel Eisenstein
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{tag=Physicist}
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<Daniel Eisenstein> led a study detecting a characteristic acoustic feature in the spatial correlations of distant <galaxies>. The analysis links late-time clustering with the earlier sound-wave physics encoded in the <baryon acoustic oscillation> scale.<Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies by Daniel Eisenstein and others>[Abstract: acoustic peak and cosmological-distance information]{ref}
The feature acts as a statistical ruler, rather than a repeated fixed separation between every pair of galaxies. Inferring distances from it requires a survey selection model and a prediction for the physical scale.
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