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.
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