Interacting neutrinos in cosmology: exact description and constraints - INSPIRE

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Interacting neutrinos in cosmology: exact description and constraints

Isabel M. Oldengott
(
- Bielefeld U.
)
,
Thomas Tram
(
- Aarhus U. and
- Portsmouth U., ICG
)
,
Cornelius Rampf
(
- Heidelberg U. and
- Technion
)
,
Yvonne Y.Y. Wong
(
- New South Wales U.
)

Jun 7, 2017

24 pages

Published in:

JCAP 11 (2017) 027

Published: Nov 17, 2017

e-Print:

1706.02123 [astro-ph.CO]

DOI:

10.1088/1475-7516/2017/11/027

View in:

ADS Abstract Service

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Abstract: (IOP)

We consider the impact of neutrino self-interactions described by an effective four-fermion coupling on cosmological observations. Implementing the exact Boltzmann hierarchy for interacting neutrinos first derived in [1] into the Boltzmann solver CLASS, we perform a detailed numerical analysis of the effects of the interaction on the cosmic microwave background (CMB) anisotropies, and compare our results with known approximations in the literature. While we find good agreement between our exact approach and the relaxation time approximation used in some recent studies, the popular (ceff2,cvis2)-parameterisation fails to reproduce the correct scale dependence of the CMB temperature power spectrum. We then proceed to derive constraints on the effective coupling constant Geff using currently available cosmological data via an MCMC analysis. Interestingly, our results reveal a bimodal posterior distribution, where one mode represents the standard ΛCDM limit with Geff 108 GF, and the other a scenario in which neutrinos self-interact with an effective coupling constant Geff 3 × 109 GF.

Note:

25 pages, 11 figures; accepted for publication in JCAP

neutrino: interaction
cosmic background radiation: temperature
power spectrum: temperature
interaction: effect
Monte Carlo: Markov chain
cosmological model: parameter space
coupling constant
scale dependence
anisotropy
hierarchy

References(40)

Figures(11)

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