511 keV line and diffuse gamma rays from moduli
نویسندگان
چکیده
منابع مشابه
The galactic 511 keV line from electroweak scale WIMPs
We consider possible mechanisms via which electroweak scale WIMPs χ could provide the source of the INTEGRAL/SPI 511 keV photon flux from the galactic centre. We consider scenarios where the WIMP spectrum contains near-degeneracies, with MeV-scale splitting, and focus on three possible production mechanisms for galactic positrons: (i) collisional excitation of the WIMP to a nearby charged state...
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We obtain the spectrum of gamma ray emissions from the moduli whose decay into ee accounts for the 511 keV line observed by SPI/INTERGRAL. The moduli emit gamma rays through internal bremsstrahlung, and also decay directly into two gammas via tree and/or one-loop diagrams. We show that the internal bremsstahlung constrains the mass of the moduli below ∼ 40 MeV modelindependently. On the other h...
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Two models of dark matter are examined in the context of the bright 511 keV gamma-ray signal observed from the center of the galaxy by the INTEGRAL satellite. A model of annihilating MeV-scale dark matter has been shown by Boehm et al. to be able to provide the required flux of positrons to explain the INTEGRAL signal, and the possible experimental consequences of this model are investigated in...
متن کاملDiffuse Gamma-rays from Local Group Galaxies
Diffuse γ-ray radiation in galaxies is produced by cosmic ray interactions with the interstellar medium. With the completion of EGRET observations, the only extragalactic object from which there has been a positive detection of diffuse γ-ray emission is the Large Magellanic Cloud. We systematically estimate the expected diffuse γ-ray flux from Local Group galaxies, and determine their detectabi...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2006
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.73.063007