scholarly journals Confronting recent AMS-02 positron fraction and Fermi-LAT extragalactic γ-ray background measurements with gravitino dark matter

2016 ◽  
Vol 11 ◽  
pp. 1-10 ◽  
Author(s):  
Edson Carquín ◽  
Marco A. Díaz ◽  
Germán A. Gómez-Vargas ◽  
Boris Panes ◽  
Nicolás Viaux
Keyword(s):  
Dark Matter ◽  
Positron Fraction ◽  
Γ Ray

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 Formation of massive globular clusters with dark matter and its implication on dark matter annihilation

2020 ◽  
Vol 496 (1) ◽  
pp. L70-L74
Author(s):  
Henriette Wirth ◽  
Kenji Bekki ◽  
Kohei Hayashi
Keyword(s):  
Dark Matter ◽  
Observational Studies ◽  
Globular Clusters ◽  
Galactic Halo ◽  
Dwarf Galaxies ◽  
Large Range ◽  
Dark Matter Annihilation ◽  
Central Regions ◽  
Γ Ray ◽  
The Masses

ABSTRACT Recent observational studies of γ-ray emission from massive globular clusters (GCs) have revealed possible evidence of dark matter (DM) annihilation within GCs. It is, however, still controversial whether the emission comes from DM or from millisecond pulsars. We here present the new results of numerical simulations, which demonstrate that GCs with DM can originate from nucleated dwarfs orbiting the ancient Milky Way. The simulated stripped nuclei (i.e. GCs) have the central DM densities ranging from 0.1 to several M⊙ pc−3, depending on the orbits and the masses of the host dwarf galaxies. However, GCs born outside the central regions of their hosts can have no/little DM after their hosts are destroyed and the GCs become the Galactic halo GCs. These results suggest that only GCs originating from stellar nuclei of dwarfs can possibly have DM. We further calculate the expected γ-ray emission from these simulated GCs and compare them to observations of ω Cen. Given the large range of DM densities in the simulated GCs, we suggest that the recent possible detection of DM annihilation from GCs should be more carefully interpreted.

scholarly journals Positron fraction from dark matter annihilation in the CMSSM

2002 ◽  
Vol 113 (1-3) ◽  
pp. 221-228 ◽  
Author(s):  
W. de Boer ◽  
C. Sander ◽  
M. Horn ◽  
D. Kazakov
Keyword(s):  
Dark Matter ◽  
Dark Matter Annihilation ◽  
Positron Fraction

scholarly journals CLUMPY v3: γ-ray and ν signals from dark matter at all scales

2019 ◽  
Vol 235 ◽  
pp. 336-345 ◽  
Author(s):  
Moritz Hütten ◽  
Céline Combet ◽  
David Maurin
Keyword(s):  
Dark Matter ◽  
Γ Ray

scholarly journals MeV-GeV γ-ray telescopes probing axino LSP/gravitino NLSP as dark matter in the μνSSM

2020 ◽  
Vol 2020 (01) ◽  
pp. 058-058 ◽  
Author(s):  
Germán A. Gómez-Vargas ◽  
Daniel E. López-Fogliani ◽  
Carlos Muñoz ◽  
Andres D. Perez
Keyword(s):  
Dark Matter ◽  
Γ Ray
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