Measurement of Neutrino Masses from Relative Velocities
arXiv:1311.3422 · doi:10.1103/PhysRevLett.113.131301
Abstract
We present a new technique to measure neutrino masses using their flow field relative to dark matter. Present day streaming motions of neutrinos relative to dark matter and baryons are several hundred km/s, comparable with their thermal velocity dispersion. This results in a unique dipole anisotropic distortion of the matter-neutrino cross power spectrum, which is observable through the dipole distortion in the cross correlation of different galaxy populations. Such a dipole vanishes if not for this relative velocity and so it is a clean signature for neutrino mass. We estimate the size of this effect and find that current and future galaxy surveys may be sensitive to these signature distortions.
5 pages, 4 figures, 1 table, version2 with supplemental materials, v3 matches the published version
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- Cosmological Simulations with Massive Neutrinos: Efficiency and Accuracy