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Originally published in Science Express on 24 May 2001
Science 22 June 2001:
Vol. 292. no. 5525, pp. 2302 - 2303
DOI: 10.1126/science.1060440
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Reports

Acoustic Oscillations in the Early Universe and Today

Christopher J. Miller,1 Robert C. Nichol,1 David J. Batuski2

During its first sim=100,000 years, the universe was a fully ionized plasma with a tight coupling by Thompson scattering between the photons and matter. The trade-off between gravitational collapse and photon pressure causes acoustic oscillations in this primordial fluid. These oscillations will leave predictable imprints in the spectra of the cosmic microwave background and the present-day matter-density distribution. Recently, the BOOMERANG and MAXIMA teams announced the detection of these acoustic oscillations in the cosmic microwave background (observed at redshift sim= 1000). Here, we compare these CMB detections with the corresponding acoustic oscillations in the matter-density power spectrum (observed at redshift sim= 0.1). These consistent results, from two different cosmological epochs, provide further support for our standard Hot Big Bang model of the universe.

1 Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
2 Department of Physics and Astronomy, University of Maine, Orono, ME 04469, USA.

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