Sterile neutrino dark matter catalyzed by a very light dark photon

Alonso-Álvarez, Gonzalo; Cline, James M.

doi:10.48550/arxiv.2107.07524

Cited by 3 publications

(3 citation statements)

References 92 publications

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“…[9] we had assumed φ to be a scalar and the decay described by a Yukawa interaction, motivated by Majoron models [29][30][31] in which a new Goldstone boson of a spontaneously broken global U (1) B−L symmetry couples to neutrinos. Another possibility arises within gauged L i − L j models, where a new vector boson plays the role of the massless state [32][33][34][35]. Models of neutrinos decaying on cosmological timescales can be found in Refs.…”

Section: The Physical Systemmentioning

confidence: 99%

Weaker yet again: mass spectrum-consistent cosmological constraints on the neutrino lifetime

et al. 2022

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We consider invisible neutrino decay $$\nu _H \rightarrow \nu _l + \phi $$ ν H → ν l + ϕ in the ultra-relativistic limit and compute the neutrino anisotropy loss rate relevant for the cosmic microwave background (CMB) anisotropies. Improving on our previous work which assumed massless$$\nu _l$$ ν l and $$\phi $$ ϕ , we reinstate in this work the daughter neutrino mass $$m_{\nu l}$$ m ν l in a manner consistent with the experimentally determined neutrino mass splittings. We find that a nonzero $$m_{\nu l}$$ m ν l introduces a new phase space factor in the loss rate $$\varGamma _\mathrm{T}$$ Γ T proportional to $$(\varDelta m_\nu ^2/m_{\nu _H}^2)^2$$ ( Δ m ν 2 / m ν H 2 ) 2 in the limit of a small squared mass gap between the parent and daughter neutrinos, i.e., $$\varGamma _\mathrm{T} \sim (\varDelta m_\nu ^2/m_{\nu H}^2)^2 (m_{\nu H}/E_\nu )^5 (1/\tau _0)$$ Γ T ∼ ( Δ m ν 2 / m ν H 2 ) 2 ( m ν H / E ν ) 5 ( 1 / τ 0 ) , where $$\tau _0$$ τ 0 is the $$\nu _H$$ ν H rest-frame lifetime. Using a general form of this result, we update the limit on $$\tau _0$$ τ 0 using the Planck 2018 CMB data. We find that for a parent neutrino of mass $$m_{\nu H} \lesssim 0.1$$ m ν H ≲ 0.1 eV, the new phase space factor weakens the constraint on its lifetime by up to a factor of 50 if $$\varDelta m_\nu ^2$$ Δ m ν 2 corresponds to the atmospheric mass gap and up to $$10^{5}$$ 10 5 if the solar mass gap, in comparison with naïve estimates that assume $$m_{\nu l}=0$$ m ν l = 0 . The revised constraints are (i) $$\tau ^0 > rsim (6 \rightarrow 10) \times 10^5$$ τ 0 ≳ ( 6 → 10 ) × 10 5 s and $$\tau ^0 > rsim (400 \rightarrow 500)$$ τ 0 ≳ ( 400 → 500 ) s if only one neutrino decays to a daughter neutrino separated by, respectively, the atmospheric and the solar mass gap, and (ii) $$\tau ^0 > rsim (2 \rightarrow 6) \times 10^7$$ τ 0 ≳ ( 2 → 6 ) × 10 7 s in the case of two decay channels with one near-common atmospheric mass gap. In contrast to previous, naïve limits which scale as $$m_{\nu H}^5$$ m ν H 5 , these mass spectrum-consistent $$\tau _0$$ τ 0 constraints are remarkably independent of the parent mass and open up a swath of parameter space within the projected reach of IceCube and other neutrino telescopes in the next two decades.

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Section: The Physical Systemmentioning

confidence: 99%

Weaker yet again: mass spectrum-consistent cosmological constraints on the neutrino lifetime

et al. 2022

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“…There have been many attempts to connect the mentioned two mysterious sectors, i.e., neutrinos and ultralight DM [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. In this work, we investigate 0νββ decays in the presence of a coupling between neutrinos and the ultralight DM with a general mass spanning from 10 −22 eV to sub-eV.…”

Section: Introductionmentioning

confidence: 99%

Neutrino meets ultralight dark matter: $\boldsymbol{0νββ}$ decay and cosmology

Huang,

Nath

2021

Preprint

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We explore the neutrinoless double beta (0νββ) decay induced by an ultralight dark matter field coupled to neutrinos. The effect on 0νββ decay is significant if the coupling violates the lepton number, for which the ∆L = 2 transition is directly driven by the dark matter field without further suppression of small neutrino masses. As the ultralight dark matter can be well described by a classical field, the effect features a periodic modulation pattern in decay events. However, we find that in the early Universe such coupling will be very likely to alter the standard cosmological results. In particular, the requirement of neutrino free-streaming before the matter-radiation equality severely constrains the parameter space, such that the future 0νββ decay experiments can hardly see any signal even with a meV sensitivity to the effective neutrino mass.I.

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“…The ultralight field can be treated as a classical one, and the neutrino dispersion relation is affected simply by assigning an expectation value to the dark field in the Lagrangian. Modified neutrino oscillations in such scenarios have been discussed in detail in the literature [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]; • coherent forward scattering of neutrinos with light dark matter particles, which could be scalar or vector, the so-called "dark NSI" [34]. In this case, it is the elastic scattering of the neutrino wave function off the dark matter grid which changes the dispersion relation.…”

Section: Introductionmentioning

confidence: 99%

Tritium beta decay with modified neutrino dispersion relations: KATRIN in the dark sea

Huang¹,

Rodejohann²

2021

Preprint

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We discuss beta decays in a dark background field, which could be formed by dark matter, dark energy or a fifth force potential. In such scenarios, the neutrino's dispersion relation will be modified by its collective interaction with the dark field, which can have observable consequences in experiments using tritium beta decays to determine the absolute neutrino mass. Among the most general interaction forms, the (pseudo)scalar and (axial-)vector ones are found to have interesting effects on the spectrum of beta decays. In particular, the vector and axial-vector potentials can induce distinct signatures by shifting the overall electron energy scale, possibly beyond the usually defined endpoint. The scalar and pseudoscalar potentials are able to mimic a neutrino mass beyond the cosmological bounds. We have placed stringent constraints on the dark potentials based on the available experimental data of KATRIN, and the sensitivity of future KATRIN runs is also discussed.

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Sterile neutrino dark matter catalyzed by a very light dark photon

Cited by 3 publications

References 92 publications

Weaker yet again: mass spectrum-consistent cosmological constraints on the neutrino lifetime

Weaker yet again: mass spectrum-consistent cosmological constraints on the neutrino lifetime

Neutrino meets ultralight dark matter: $\boldsymbol{0νββ}$ decay and cosmology

Tritium beta decay with modified neutrino dispersion relations: KATRIN in the dark sea

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