First Detection of the Acoustic Oscillation Phase Shift Expected from the Cosmic Neutrino Background.

@article{Follin2015FirstDO,
  title={First Detection of the Acoustic Oscillation Phase Shift Expected from the Cosmic Neutrino Background.},
  author={B. Follin and L. Knox and M. Millea and Zhen Pan},
  journal={Physical review letters},
  year={2015},
  volume={115 9},
  pages={
          091301
        }
}
The unimpeded relativistic propagation of cosmological neutrinos prior to recombination of the baryon-photon plasma alters gravitational potentials and therefore the details of the time-dependent gravitational driving of acoustic oscillations. We report here a first detection of the resulting shifts in the temporal phase of the oscillations, which we infer from their signature in the cosmic microwave background temperature power spectrum. 
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