Sterile neutrinos with eV masses in cosmology — How disfavoured exactly?

Hamann, Jan; Hannestad, Steen; Raffelt, Georg G.; Wong, Yvonne Y. Y.

doi:10.1088/1475-7516/2011/09/034

Cited by 190 publications

(200 citation statements)

References 71 publications

(95 reference statements)

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“…Moreover, EDM constraints will become more severe if collider bounds on leptoquark masses are improved, as shown in Eqs. (29) and (39).…”

Section: Discussionmentioning

confidence: 99%

CPviolation in beta decay and electric dipole moments

Tulin

2012

Phys. Rev. D

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The T-odd correlation coefficient D in nuclear β-decay probes CP violation in many theories beyond the Standard Model. We provide an analysis for how large D can be in light of constraints from electric dipole moment (EDM) searches. We argue that the neutron EDM d n currently provides the strongest constraint on D, which is 10 − 10 3 times stronger than current direct limits on D (depending on the model). In particular, contributions to D in leptoquark models (previously regarded as "EDM safe") are more constrained than previously thought. Bounds on D can be weakened only by fine-tuned cancellations or if theoretical uncertainties are larger than estimated in d n . We also study implications for D from mercury and deuteron EDMs.

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“…Moreover, EDM constraints will become more severe if collider bounds on leptoquark masses are improved, as shown in Eqs. (29) and (39).…”

Section: Discussionmentioning

confidence: 99%

CPviolation in beta decay and electric dipole moments

Tulin

2012

Phys. Rev. D

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“…With this in mind it is clear that accommodating eV sterile neutrinos requires addition of new physics either in cosmology or in the neutrino sector (see e.g. [30] for a discussion).…”

Section: Discussionmentioning

confidence: 99%

Sterile neutrinos with pseudoscalar self-interactions and cosmology

et al. 2016

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Sterile neutrinos in the electronvolt mass range are hinted at by a number of terrestrial neutrino experiments. However, such neutrinos are highly incompatible with data from the Cosmic Microwave Background and large scale structure. This paper discusses how charging sterile neutrinos under a new pseudoscalar interaction can reconcile eV sterile neutrinos with terrestrial neutrino data. We show that this model can reconcile eV sterile neutrinos in cosmology, providing a fit to all available data which is way better than the standard ΛCDM model with one additional fully thermalized sterile neutrino. In particular it also prefers a value of the Hubble parameter much closer to the locally measured value.

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“…The process of standard big bang nucleosynthesis (BBN) can be accurately modelled, and gives a predicted relation between Y P , the photon-baryon ratio, and the expansion rate (which depends on the number of relativistic degrees of freedom). By default we use interpolated results from the PArthENoPE BBN code (Pisanti et al 2008) to set Y P , following Hamann et al (2011), which for the Planck best-fitting base model (assuming no additional relativistic components and negligible neutrino degeneracy) gives Y P = 0.2477. We shall compare our results with the predictions of BBN in Sect.…”

Section: Matter and Radiation Contentmentioning

confidence: 99%

“…The thermal and Dodelson-Widrow scenarios considered here are representative of a large number of possible models that have recently been investigated in the literature (Hamann et al 2011;Diamanti et al 2013;Archidiacono et al 2012;Hannestad et al 2012). …”

Section: Constraints On N Effmentioning

confidence: 99%

Planck2013 results. XVI. Cosmological parameters

Ade¹,

Aghanim²,

Armitage-Caplan³

et al. 2014

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This paper presents the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra. We find that the Planck spectra at high multipoles ( > ∼ 40) are extremely well described by the standard spatiallyflat six-parameter ΛCDM cosmology with a power-law spectrum of adiabatic scalar perturbations. Within the context of this cosmology, the Planck data determine the cosmological parameters to high precision: the angular size of the sound horizon at recombination, the physical densities of baryons and cold dark matter, and the scalar spectral index are estimated to be θ * = (1.04147 ± 0.00062) × 10 −2 , Ω b h 2 = 0.02205 ± 0.00028, Ω c h 2 = 0.1199 ± 0.0027, and n s = 0.9603 ± 0.0073, respectively (note that in this abstract we quote 68% errors on measured parameters and 95% upper limits on other parameters). For this cosmology, we find a low value of the Hubble constant, H 0 = (67.3 ± 1.2) km s −1 Mpc −1 , and a high value of the matter density parameter, Ω m = 0.315 ± 0.017. These values are in tension with recent direct measurements of H 0 and the magnituderedshift relation for Type Ia supernovae, but are in excellent agreement with geometrical constraints from baryon acoustic oscillation (BAO) surveys. Including curvature, we find that the Universe is consistent with spatial flatness to percent level precision using Planck CMB data alone. We use high-resolution CMB data together with Planck to provide greater control on extragalactic foreground components in an investigation of extensions to the six-parameter ΛCDM model. We present selected results from a large grid of cosmological models, using a range of additional astrophysical data sets in addition to Planck and high-resolution CMB data. None of these models are favoured over the standard six-parameter ΛCDM cosmology. The deviation of the scalar spectral index from unity is insensitive to the addition of tensor modes and to changes in the matter content of the Universe. We find an upper limit of r 0.002 < 0.11 on the tensor-to-scalar ratio. There is no evidence for additional neutrino-like relativistic particles beyond the three families of neutrinos in the standard model. Using BAO and CMB data, we find N eff = 3.30 ± 0.27 for the effective number of relativistic degrees of freedom, and an upper limit of 0.23 eV for the sum of neutrino masses. Our results are in excellent agreement with big bang nucleosynthesis and the standard value of N eff = 3.046. We find no evidence for dynamical dark energy; using BAO and CMB data, the dark energy equation of state parameter is constrained to be w = −1.13 +0.13 −0.10 . We also use the Planck data to set limits on a possible variation of the fine-structure constant, dark matter annihilation and primordial magnetic fields. Despite the success of the six-parameter ΛCDM model in describing the Planck data at high multipoles, we note that this cosmology does not provide a good fit to the temperature power spectrum at low multipoles. T...

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Sterile neutrinos with eV masses in cosmology — How disfavoured exactly?

Cited by 190 publications

References 71 publications

CPviolation in beta decay and electric dipole moments

CPviolation in beta decay and electric dipole moments

Sterile neutrinos with pseudoscalar self-interactions and cosmology

Planck2013 results. XVI. Cosmological parameters

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