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Updated: Jun 24, 2026

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
Published on: August 21, 2018
Acoustic oscillations in the early universe and today
C J Miller1, R C Nichol, D J Batuski
1Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
Abstract:
During its first approximately 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 approximately 1000). Here, we compare these CMB detections with the corresponding acoustic oscillations in the matter-density power spectrum (observed at redshift approximately 0.1). These consistent results, from two different cosmological epochs, provide further support for our standard Hot Big Bang model of the universe.
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