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={Brent Follin and Lloyd Knox and Marius 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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