Dual MeV gamma-ray and dark matter observatory - GRAMS Project
نویسندگان
چکیده
منابع مشابه
Gamma Ray Astronomy and Baryonic Dark Matter
Recently, Dixon et al. (1998) have re-analyzed the EGRET data, finding a statistically significant diffuse γ-ray emission from the galactic halo. We show that this emission can naturally be explained within a previously-proposed model for baryonic dark matter, in which γ-rays are produced through the interaction of high-energy cosmic-ray protons with cold H2 clouds clumped into dark clusters th...
متن کاملGamma-ray Constraint on galactic positron production by MeV dark matter.
The Galactic positrons, as observed by their annihilation gamma-ray line at 0.511 MeV, are difficult to account for with astrophysical sources. It has been proposed that they are produced instead by dark matter annihilation or decay in the inner Galactic halo. To avoid other constraints, these processes are required to occur "invisibly," such that the eventual positron annihilation is the only ...
متن کاملGamma-ray Signatures of Dark Matter Particles
Indirect detection methods of dark matter particles are discussed. In particular, detection of supersymmetric dark matter through annihilation into gamma-rays is described. Aspects of the density structure of dark matter halos, important for estimating the chances of detection, are discussed. A new class of dark matter candidates, related to non-vanishing neutrinos masses and seemingly only det...
متن کاملGamma ray constraints on Decaying Dark Matter
We derive new bounds on decaying Dark Matter from the gamma ray measurements of (i) the isotropic residual (extragalactic) background by Fermi and (ii) the Fornax galaxy cluster by H.E.S.S.. We find that those from (i) are among the most stringent constraints currently available, for a large range of DM masses and a variety of decay modes, excluding half-lives up to ∼ 1026 to few 1027 seconds. ...
متن کاملMeV-mass dark matter and primordial nucleosynthesis
The annihilation of new dark matter candidates with masses mX in the MeV range may account for the galactic positrons that are required to explain the 511 keV γ-ray flux from the galactic bulge. We study the impact of MeV-mass thermal relic particles on the primordial synthesis of H, He, and Li. If the new particles are in thermal equilibrium with neutrinos during the nucleosynthesis epoch they...
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ژورنال
عنوان ژورنال: Astroparticle Physics
سال: 2020
ISSN: 0927-6505
DOI: 10.1016/j.astropartphys.2019.07.002