Gamma-ray Constraint on galactic positron production by MeV dark matter.
Phys Rev Lett
; 94(17): 171301, 2005 May 06.
Article
en En
| MEDLINE
| ID: mdl-15904276
ABSTRACT
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 detectable signal. However, electromagnetic radiative corrections to these processes inevitably produce real gamma rays ("internal bremsstrahlung"); this emission violates COMPTEL and EGRET constraints unless the dark matter mass is less than about 20 MeV.
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01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2005
Tipo del documento:
Article
País de afiliación:
Estados Unidos