Revisiting multicomponent dark matter with new AMS-02 data

Geng, Chao–Qiang; Huang, Da; Lai, Chang

doi:10.1103/physrevd.91.095006

Cited by 18 publications

(19 citation statements)

References 98 publications

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“…For example Geng et al [4] found that a two-component decaying dark matter, with a heavy particle decaying to µ + µ − and a lighter particle decaying to τ + τ − , could fit both AMS-02 [63] and Fermi-LAT [64] data. Meanwhile Hamaguchi et al [5] found that a decay into W ± l ∓ could explain the AMS-02 antiproton observation.…”

Section: Resultsmentioning

confidence: 99%

“…The hypothesis in these cases is that these unexpected observations of very high energy neutrinos and/or a high positron fraction with a cutoff can be explained by the decay of a dark matter candidate (regarding the high energy neutrinos see [22] and see [4,5] and references therein for the AMS-02 positron fraction). Another experimentally interesting measurement is the presence of an excess of 3.5 keV * Electronic address: blackadder@brown.edu † Electronic address: koushiappas@brown.edu photons along the line of sight to the Andromeda galaxy (M31) as well as other galaxies and galaxy clusters (as observed in a stacked analysis) [23,24].…”

Section: Introductionmentioning

confidence: 99%

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Cosmological constraints to dark matter with two- and many-body decays

Blackadder

Koushiappas

2016

Phys. Rev. D

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We present a study of cosmological implications of generic dark matter decays. We consider twobody and many-body decaying scenarios. In the two-body case the massive particle has a possibly relativistic kick velocity and thus possesses a dynamical equation of state. This has implications to the expansion history of the universe. We use recent observational data from the cosmic microwave background, baryon acoustic oscillations and supernovae Type Ia to obtain constraints on the lifetime of the dark matter particle. We find that for an energy splitting where more than 40% of the dark matter particle energy is transferred to massless, relativistic particles in the two-body case, or more than 50% in the many-body case, lifetimes less than the age of the universe are excluded at more than 95% confidence. When the energy splitting falls to 10% the lifetime is constrained to be more than roughly half the age.PACS numbers: 98.80.-k, 95.35.+d

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cosmological constraints to dark matter with two- and many-body decays

Blackadder

Koushiappas

2016

Phys. Rev. D

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“…16. We expect that the new AMS-02 releases could give us new insight toward the cosmic ray anomalies and the DM interpretation.…”

Section: Cosmic Ray Anomaliesmentioning

confidence: 96%

“…Note that in our calculation we use the same parameter set for the e + /e − diffuse propagations as those listed in Table I in Ref. 16. Finally, it is generally expected that the positron and electron fluxes are suffered from the solar modulation, especially for those with energies below 10 GeV.…”

Section: Multi-component Dark Matter Decaysmentioning

confidence: 96%

Multi-component dark matter

Geng

Huang

Lai

2015

Int. J. Mod. Phys. A

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We review the multi-component decaying dark matter (DM) scenario to explain the possible cosmic ray excesses in the positron fraction, the positron and electron respective fluxes, and the total e + +e − flux observed by AMS-02. We show that the two-component DM model can fit the AMS-02 datasets. In particular, we demonstrate that the heavier DM component with its mass around 1 TeV dominantly decaying through the e and μ-channels describes the high-energy behavior of the total e + + e − flux data above 500 GeV, while the lighter one of O(100) GeV mainly through the τ -channel explains the substructure around 100 GeV.

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“…Since direct and indirect detection (considering annihilations only, for stable DM) rates of DM are directly proportional to the DM density and DM density squared respectively, multi-component DM models can find larger allowed region of parameter space by appropriate tuning of their relative abundance. In addition to that, such multi-component DM scenarios often give rise to very interesting signatures at direct and indirect detection experiments [23,32,37,[52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69].…”

Section: Introductionmentioning

confidence: 99%

Type III seesaw for neutrino masses in U(1)B−L model with multi-component dark matter

Biswas

Borah

Nanda

2019

J. High Energ. Phys.

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We propose a B − L gauged extension of the Standard Model where light neutrino masses arise from type III seesaw mechanism. Unlike the minimal B −L model with three right handed neutrinos having unit lepton number each, the model with three fermion triplets is however not anomaly free. We show that the leftover triangle anomalies can be cancelled by two neutral Dirac fermions having fractional B − L charges, both of which are naturally stable by virtue of a remnant Z 2 × Z 2 symmetry, naturally leading to a two component dark matter scenario without any ad-hoc symmetries. We constrain the model from all relevant phenomenological constraints including dark matter properties. Light neutrino mass and collider prospects are also discussed briefly. Due to additional neutral gauge bosons, the fermion triplets in type III seesaw can have enhanced production cross section in collider experiment.

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Revisiting multicomponent dark matter with new AMS-02 data

Cited by 18 publications

References 98 publications

Cosmological constraints to dark matter with two- and many-body decays

Cosmological constraints to dark matter with two- and many-body decays

Multi-component dark matter

Type III seesaw for neutrino masses in U(1)B−L model with multi-component dark matter

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