Dark matter relic abundance and light sterile neutrinos

Tang, Yilei; Zhu, Shou-hua

doi:10.1007/jhep01(2017)025

Cited by 20 publications

(14 citation statements)

References 50 publications

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“…If the mass of the sterile neutrino is comparable with the electro-weak phase transition temperature ∼ 100 GeV, W /Z gauge boson mass shifts and the Goldstone boson fractions might play crucial roles. This is important in the sterile neutrino portal dark matter models [31][32][33][34][35][36][37]. Such a sterile neutrino can also induce the leptogenesis [27].…”

Section: Discussion and Possible Applicationsmentioning

confidence: 99%

Structures of the massive vector boson propagators at finite temperature illuminated by the Goldstone equivalence gauge

Tang

2020

J. High Energ. Phys.

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Inspired by the Goldstone equivalence gauge, we study the thermal corrections to an originally massive vector boson by checking the poles and branch cuts. We find that part of the Goldstone boson is spewed out from the longitudinal polarization, becoming a branch cut which can be approximated by the “quasi-poles” in the thermal environment. In this case, physical Goldstone boson somehow partly recovers. We also show the Feynmann rules for the “external legs” of these vector boson as well as the recovered Goldstone boson, expecting to simplify the vector boson participated process calculations by adopting the similar “tree-level” logic as in the zero temperature situation. Gauge boson mixing case are also discussed. Similar results are shown in other gauges, especially in the Rξ gauge.

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Section: Discussion and Possible Applicationsmentioning

confidence: 99%

Structures of the massive vector boson propagators at finite temperature illuminated by the Goldstone equivalence gauge

Tang

2020

J. High Energ. Phys.

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“…It is worth noticing that for sufficiently small Yukawa couplings of the sterile neutrinos, it could happen that the DM Ψ and N bath decouple from the SM after the decay of the dark scalar, T M φ , and remain in thermal equilibrium but with a different temperature. In this case, the DM freeze-out leads to a larger relic abundance, so that a larger annihilation cross section (and thus a larger coupling between DM and sterile neutrinos) is needed to reproduce the observed value [21,22]. In Sec.…”

Section: Sterile Neutrino Portal To Dark Mattermentioning

confidence: 94%

“…Note however than in some cases the dark sector (including the sterile neutrino) could be at a different temperature than the SM, so that a larger freeze-out annihilation cross section is required to fit the observed DM abundance [21,22]. Therefore a larger region of the parameter space (M Ψ , M N ) is excluded in such cases.…”

Section: Constraints From Indirect Detection: Gamma Rays From Dsphs A...mentioning

confidence: 99%

Probing the sterile neutrino portal to Dark Matter with γ rays

Folgado¹,

Gomez-Vargas²,

Rius³

et al. 2018

J. Cosmol. Astropart. Phys.

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Sterile neutrinos could provide a link between the Standard Model particles and a dark sector, besides generating active neutrino masses via the seesaw mechanism type I. We show that, if dark matter annihilation into sterile neutrinos determines its observed relic abundance, it is possible to explain the Galactic Center γ-ray excess reported by the Fermi-LAT Collaboration as due to an astrophysical component plus dark matter annihilations. We observe that sterile neutrino portal to dark matter provides an impressively good fit, with a p-value of 0.78 in the best fit point, to the Galactic Center γ-ray flux, for DM masses in the range (40-80) GeV and sterile neutrino masses 20 GeV M N < M DM . Such values are compatible with the limits from Fermi-LAT observations of the dwarfs spheroidal galaxies in the Milky Way halo, which rule out dark matter masses below ∼ 50 GeV (90 GeV), for sterile neutrino masses M N M DM (M N M DM ). We also estimate the impact of AMS-02 anti-proton data on this scenario.

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“…[2]; in addition, Ref. [40] analyses the cases when N and χ have similar masses and Ref. [5] when also φ does.…”

Section: Model A1: Real Scalarmentioning

confidence: 99%

Sterile neutrino portals to Majorana dark matter: effective operators and UV completions

Coito,

Faubel,

Herrero-García

et al. 2022

Preprint

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Stringent constraints on the interactions of dark matter with the Standard Model suggest that dark matter does not take part in gauge interactions. In this regard, the possibility of communicating between the visible and dark sectors via gauge singlets seems rather natural. We consider a framework where the dark matter talks to the Standard Model through its coupling to sterile neutrinos, which generate active neutrino masses. We focus on the case of Majorana dark matter, with its relic abundance set by thermal freeze-out through annihilations into sterile neutrinos. We use an effective field theory approach to study the possible sterile neutrino portals to dark matter. We find that both lepton-number-conserving and lepton-number-violating operators are possible, yielding an interesting connection with the Dirac/Majorana character of active neutrinos. In a second step, we open the different operators and outline the possible renormalisable models. We analyse the phenomenology of the most promising ones, including a particular case in which the Majorana mass of the sterile neutrinos is generated radiatively.

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Dark matter relic abundance and light sterile neutrinos

Cited by 20 publications

References 50 publications

Structures of the massive vector boson propagators at finite temperature illuminated by the Goldstone equivalence gauge

Structures of the massive vector boson propagators at finite temperature illuminated by the Goldstone equivalence gauge

Probing the sterile neutrino portal to Dark Matter with γ rays

Sterile neutrino portals to Majorana dark matter: effective operators and UV completions

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