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• W3099694585 abstract "Neutrino interactions beyond the standard model of particle physics may affect the cosmological evolution and can be constrained through observations. We consider the possibility that neutrinos possess secret scalar or pseudoscalar interactions mediated by the Nambu-Goldstone boson of a still unknown spontaneously broken global U(1) symmetry, as in, e.g., Majoron models. In such scenarios, neutrinos still decouple at T≃ 1 MeV, but become tightly coupled again (``recouple'') at later stages of the cosmological evolution. We use available observations of the cosmic microwave background (CMB) anisotropies, including Planck 2013 and the joint BICEP2/Planck 2015 data, to derive constraints on the quantity γνν4, parameterizing the neutrino collision rate due to scalar or pseudoscalar interactions. We consider both a minimal extension of the standard ΛCDM model, and more complicated scenarios with extra relativistic degrees of freedom or non-vanishing tensor amplitude. For a wide range of dataset and model combinations, we find a typical constraint γνν4 ≲ 0.9× 10−27 (95% C.L.), implying an upper limit on the redshift zνrec of neutrino recoupling 0≲ 850, leaving open the possibility that the latter occured well before hydrogen recombination. In the framework of Majoron models, the upper limit on γνν roughly translates on a constraint g ≲ 8.2× 10−7 on the Majoron-neutrino coupling constant g. In general, the data show a weak (∼ 1σ) but intriguing preference for non-zero values of γνν4, with best fits in the range γνν4 = (0.15–0.35)× 10−27, depending on the particular dataset. This is more evident when either high-resolution CMB observations from the ACT and SPT experiments are included, or the possibility of non-vanishing tensor modes is considered. In particular, for the minimal model ΛCDM+γνν and including the Planck 2013, ACT and SPT data, we report γνν4=(0.44+0.17−0.36)×10−27 (0300 ≲ zνrec ≲ 550) at 68% confidence level." @default.
• W3099694585 created "2020-11-23" @default.
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• W3099694585 date "2015-07-09" @default.
• W3099694585 modified "2023-10-15" @default.
• W3099694585 title "Constraints on secret neutrino interactions after Planck" @default.
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• W3099694585 doi "https://doi.org/10.1088/1475-7516/2015/07/014" @default.
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