Updated constraints on non-standard neutrino interactions from Planck
By M. Archidiacono, S. Hannestad. 2013
148 citations recorded by the source corpus.
We provide updated bounds on non-standard neutrino interactions based on data from the Planck satellite as well as auxiliary cosmological measurements. Two types of models are studied - A Fermi-like 4-point interaction and an interaction mediated by a light pseudoscalar - and we show that these two models are representative of models in which neutrinos either decouple or recouple in the early Universe. Current cosmological data constrain the effective 4-point coupling to be GX ⩽ (0.06 GeV)-2, corresponding to GX ⩽ 2.5 × 107 GF. For non-standard pseudoscalar interactions we set a limit on the diagonal elements of the dimensionless coupling matrix, gij, of gii ⩽ 1.2 × 10-7. For the off-diagonal elements which induce neutrino decay the bound is significantly stronger, corresponding to gij ⩽ 2.3 × 10-11(m/0.05 eV)-2, or a lifetime constraint of τ ⩾ 1.2 × 109 s (m/0.05 eV)3 . This is currently the strongest known bound on this particular type of neutrino decay. We finally note that extremely strong neutrino self-interactions which completely suppress anisotropic stress over all of cosmic history are very highly disfavored by current data Δ χ2 ∼ 104).
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/720520b34d69be16b83d3101ffb850e4152e70e1
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Citations in the corpus
- A tale of two modes: neutrino free-streaming in the early universe (2017, background): “Several works [13, 34, 38, 39, 44, 64] have shown that current cosmological data allow for some flexibility in the underlying theoretical assumption of neutrinos interacting solely via the weak interaction.”
- Phases of new physics in the CMB (2015, background): “[30, 39–42]), in general, do not produce a phase shift (at least as long as the fluctuations are adiabatic and their sound speed is not larger than that of the photons).”