منابع مشابه
MeV-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...
متن کاملBounds on Light Dark Matter
The nature of Dark Matter (DM) is one of the most intriguing questions of modern physics. Its resolution would have a profound impact on the development of particle physics beyond its Standard Model (SM). Although the possibility of having massive compact halo objects (MACHOs) as a dominant form of DM is still under debates (see recent discussion in [1] and references therein), it is widely bel...
متن کاملAxion hot dark matter bounds
The masses of the lightest particles are best constrained by the largest cosmic structures. The well-established method of using cosmological precision data to constrain the cosmic hot dark matter fraction [1, 2] has been extended to hypothetical low-mass particles, notably to axions, in several papers [3, 4, 5, 6, 7]. If axions thermalize after the QCD phase transition, their number density is...
متن کاملProbing MeV dark matter at low-energy e+e- colliders.
It has been suggested that the pair annihilation of dark matter particles chi with mass between 0.5 and 20 MeV into e+e- pairs could be responsible for the excess flux (detected by the INTEGRAL satellite) of 511 keV photons coming from the central region of our Galaxy. The simplest way to achieve the required cross section while respecting existing constraints is to introduce a new vector boson...
متن کاملPossible evidence for MeV dark matter in dwarf spheroidals.
The observed 511 keV emission from the galactic bulge could be due to very light (MeV) annihilating dark matter particles. To distinguish this hypothesis from conventional astrophysical sources, we study dwarf spheroidals in the region observed by the International Gamma-Ray Astrophysics Laboratory/SPI such as Sagittarius. As these galaxies have comparatively few stars, the prospects for 511 ke...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2017
ISSN: 1029-8479
DOI: 10.1007/jhep09(2017)116