Acoustic waves in the early universe

Details Acoustic waves in the early universe Acoustic waves in the early universe

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jphcs.118a2007w&link_type=abstract

Journal of Physics: Conference Series, Volume 118, Issue 1, pp. 012007 (2008).

Physics

Scientific paper

Acoustics waves in the cosmology connect the astronomically large and the astronomically small. The largest acoustic waves in the Universe are the baryon acoustic oscillations that can be seen on the sky in the Cosmic Microwave Background anisotropy and in the current distribution of galaxies with a wavelength of 8 yottameters, nearly one billion lightyears. The sound travel distance in the 400,000 years prior to the Universe becoming transparent becomes one half of this wavelength, and then the expansion of the Universe stretched all distances by a factor of 1000. Precise measurements of these signals reveal the baryon density (0.4 yoctograms per cubic meter), the dark matter density (2 yg per cubic meter), and the radius of curvature of the Universe (more than 700 yottameters).

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