scholarly journals Decaying dark matter in supersymmetric model and cosmic-ray observations

2010 ◽  
Vol 2010 (12) ◽  
Author(s):  
Koji Ishiwata ◽  
Shigeki Matsumoto ◽  
Takeo Moroi
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Supersymmetric Model ◽  
Decaying Dark Matter

scholarly journals Cosmic ray excesses from multi-component dark matter decays

2014 ◽  
Vol 29 (37) ◽  
pp. 1440003 ◽  
Author(s):  
Chao-Qiang Geng ◽  
Da Huang ◽  
Lu-Hsing Tsai
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Parameter Range ◽  
Decay Channels ◽  
Positron Fraction ◽  
Flavor Structure ◽  
Two Component ◽  
Decaying Dark Matter ◽  
Interesting Variation ◽  
Γ Ray

We use multi-component decaying dark matter (DM) scenario to explain the possible cosmic ray excesses in the positron fraction recently confirmed by AMS-02 and the total e+ +e- flux observed by Fermi-LAT. In the two-component DM models, we find an interesting variation of the flavor structure along with the cutoff of the heavy DM. For the three-component DM case, we focus on a particular parameter range in which the best fits prefer to open only two DM decay channels with a third DM contributing nothing to the electron and positron spectra. We show that all models give the reasonable fits to both the AMS-02 positron fraction and the Fermi-LAT total e++e- flux, which are also consistent with the measured diffuse γ-ray flux by Fermi-LAT.

scholarly journals Neutrino signals from annihilating/decaying dark matter in the light of recent measurements of cosmic ray electron/positron fluxes

2009 ◽  
Vol 79 (4) ◽  
Author(s):  
Junji Hisano ◽  
Masahiro Kawasaki ◽  
Kazunori Kohri ◽  
Kazunori Nakayama
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Electron Positron ◽  
Decaying Dark Matter

Multi-component dark matter

2015 ◽  
Vol 30 (28n29) ◽  
pp. 1545009 ◽  
Author(s):  
Chao-Qiang Geng ◽  
Da Huang ◽  
Chang Lai
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
High Energy ◽  
Flux Data ◽  
Positron Fraction ◽  
High Energy Behavior ◽  
Energy Behavior ◽  
Two Component ◽  
Decaying Dark Matter

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 [Formula: see text] 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 [Formula: see text] and [Formula: see text]-channels describes the high-energy behavior of the total [Formula: see text] flux data above 500 GeV, while the lighter one of O(100) GeV mainly through the [Formula: see text]-channel explains the substructure around 100 GeV.

scholarly journals Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario

2020 ◽  
Vol 2020 (04) ◽  
pp. 031-031
Author(s):  
Lei Feng ◽  
Zhaofeng Kang ◽  
Qiang Yuan ◽  
Peng-Fei Yin ◽  
Yi-Zhong Fan
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Decaying Dark Matter

scholarly journals Deep Search for Decaying Dark Matter with XMM-Newton Blank-Sky Observations

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
Joshua W. Foster ◽  
Marius Kongsore ◽  
Christopher Dessert ◽  
Yujin Park ◽  
Nicholas L. Rodd ◽  
...  
Keyword(s):  
Dark Matter ◽  
Decaying Dark Matter

scholarly journals Present and future status of light dark matter models from cosmic-ray electron upscattering

2021 ◽  
Vol 103 (9) ◽  
Author(s):  
James B. Dent ◽  
Bhaskar Dutta ◽  
Jayden L. Newstead ◽  
Ian M. Shoemaker ◽  
Natalia Tapia Arellano
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Future Status

An excess radio signal in the Abell 4038 cluster

2020 ◽  
Vol 500 (4) ◽  
pp. 5583-5588
Author(s):  
Man Ho Chan ◽  
Chak Man Lee
Keyword(s):  
Dark Matter ◽  
Spectral Data ◽  
Cross Section ◽  
Radio Signal ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Annihilation Cross Section ◽  
Radio Continuum ◽  
Test Statistic ◽  
Dark Matter Annihilation

ABSTRACT In the past decade, various instruments, such as the Large Area Telescope (LAT) on the Fermi Gamma Ray Space Telescope, the Alpha Magnetic Spectrometer (AMS) and the Dark Matter Particle Explorer(DAMPE), have been used to detect the signals of annihilating dark matter in our Galaxy. Although some excesses of gamma rays, antiprotons and electrons/positrons have been reported and are claimed to be dark matter signals, the uncertainties of the contributions of Galactic pulsars are still too large to confirm the claims. In this paper, we report on a possible radio signal of annihilating dark matter manifested in the archival radio continuum spectral data of the Abell 4038 cluster. By assuming a thermal annihilation cross-section and comparing the dark matter annihilation model with the null hypothesis (cosmic ray emission without dark matter annihilation), we obtain very large test statistic (TS) values, TS > 45, for four popular annihilation channels, which correspond to more than 6σ statistical preference. This reveals a possible potential signal of annihilating dark matter. In particular, our results are also consistent with the recent claims of dark matter mass, m ≈ 30–50 GeV, annihilating via the $\rm b\bar{b}$ quark channel with the thermal annihilation cross-section. However, at this time, we cannot exclude the possibility that a better background cosmic ray model could explain the spectral data without recourse to dark matter annihilations.

scholarly journals A possible radio signal of annihilating dark matter in the Abell 4038 cluster

2019 ◽  
Vol 495 (1) ◽  
pp. L124-L128 ◽  
Author(s):  
Man Ho Chan ◽  
Chak Man Lee
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Radio Signal ◽  
Dark Matter Particle ◽  
Cosmic Ray ◽  
Annihilation Cross Section ◽  
Radio Continuum ◽  
Test Statistic ◽  
Large Area ◽  
Dark Matter Annihilation

ABSTRACT In the past decade, some telescopes [e.g. Fermi-Large Area Telescope (LAT), Alpha Magnetic Spectrometer(AMS), and Dark Matter Particle Explorer(DAMPE)] were launched to detect the signals of annihilating dark matter in our Galaxy. Although some excess of gamma-rays, antiprotons, and electrons/positrons have been reported and claimed as dark matter signals, the uncertainties of Galactic pulsars’ contributions are still too large to confirm the claims. In this Letter, we report a possible radio signal of annihilating dark matter manifested in the archival radio continuum spectral data of the Abell 4038 cluster. By assuming the thermal annihilation cross-section and comparing the dark matter annihilation model with the null hypothesis (cosmic ray emission without dark matter annihilation), we get very large test statistic values >45 for four popular annihilation channels, which correspond to more than 6.5σ statistical preference. This provides a very strong evidence for the existence of annihilating dark matter. In particular, our results also support the recent claims of dark matter mass m ≈ 30–50 GeV annihilating via the bb̄ quark channel with the thermal annihilation cross-section.

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