Constraining invisible neutrino decays with the cosmic microwave background

Details Constraining invisible neutrino decays with the cosmic microwave background Constraining invisible neutrino decays with the cosmic microwave background

2005-09-26

arxiv.org/abs/hep-ph/0509278v1

Phys.Rev. D72 (2005) 103514

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revtex, 4 pages

Scientific paper

Precision measurements of the acoustic peaks of the cosmic microwave background indicate that neutrinos must be freely streaming at the photon decoupling epoch when T ~ 0.3 eV. This requirement implies restrictive limits on ``secret neutrino interactions,'' notably on neutrino Yukawa couplings with hypothetical low-mass (pseudo)scalars \phi. For diagonal couplings in the neutrino mass basis we find g < 1 x 10^-7, comparable to limits from supernova 1987A. For the off-diagonal couplings and assuming hierarchical neutrino masses we find g < 1 x 10^-11 (0.05 eV/m)^2 where m is the heavier mass of a given neutrino pair connected by g. This stringent limit excludes that the flavor content of high-energy neutrinos from cosmic-ray sources is modified by \nu -> \nu' + \phi decays on their way to Earth.

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