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2018

First Constraint on the Neutrino-Induced Phase Shift in the BAO Spectrum

Baumann, Daniel, Beutler, Florian, Flauger, Raphael et al.

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The existence of the cosmic neutrino background is a fascinating prediction of the hot big bang model.

These neutrinos were a dominant component of the energy density in the early universe and, therefore, played an important role in the evolution of cosmological perturbations.
The energy density of the cosmic neutrino background has been measured using the abundances of light elements and the anisotropies of the cosmic microwave background (CMB).
A complementary and more robust probe is a distinct shift in the temporal phase of sound waves in the primordial plasma which is produced by fluctuations in the neutrino density and has recently been detected in the CMB.

First Constraint on the Neutrino-Induced Phase Shift in the BAO Spectrum · Around

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