Abstract
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).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
