A First Detection of the Acoustic Oscillation Phase Shift Expected from the Cosmic Neutrino Background
arXiv:1503.07863 · doi:10.1103/PhysRevLett.115.091301
Abstract
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 (CMB) temperature power spectrum.
5 pages, 3 figures