Updated constraints on non-standard neutrino interactions from Planck

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...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2014-07, Vol.2014 (7), p.i-17
Main Authors: Archidiacono, Maria, Hannestad, Steen
Format: Article
Language:English
Subjects:
ANISOTROPY
Astronomical models
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Cosmology
Decay
INTERACTIONS
Joining
NEUTRINOS
PARTICLE DECAY
Planck satellite
UNIVERSE
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Summary: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 < or = (0.06 GeV) super(-2), corresponding to GX < or = 2.5 x 10 super(7)G F. For non-standard pseudoscalar interactions we set a limit on the diagonal elements of the dimensionless coupling matrix, gij, of gii < or = 1.2 x 10 super(-7). For the off-diagonal elements which induce neutrino decay the bound is significantly stronger, corresponding to gij < or = 2.3 x 10 super(-11)(m/0.05eV) super(-2), or a lifetime constraint of [tau] > or = 1.2 x 10 super(9) s(m/0.05eV) super(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 ( Delta chi super(2) ~ 10 super(4)).
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2014/07/046