Light Dark Matter from Entropy Dilution

Bright Light from Dark Matter

Light Higgsino Dark Matter

We re–investigate the question whether a light higgsino–like neutralino is a viable Dark Matter candidate. To this end we compute the dominant one–loop corrections to the masses of the higgsino–like states in the minimal Supersymmetric Standard Model (MSSM), due to loops involving heavy quarks and their superpartners. We also calculate analogous corrections to the couplings of higgsino–like neu...

LIGHT DARK MATTER a

We show how light spin-1 2 or spin-0 particles may be acceptable Dark Matter candidates, provided they annihilate sufficiently strongly through new interactions, such as those induced by a new light neutral spin-1 boson U. The corresponding interaction is stronger than weak interactions at lower energies, but weaker at higher energies. Annihilation cross sections of (axially coupled) spin-1 2 D...

Light on Dark Matter

Galaxies are lighthouses that sit atop peaks in the density field. There is good observational evidence that these lighthouses do not provide a uniform description of the distribution of dark matter.

Light Dark Matter

The SPI spectrometer aboard of the INTEGRAL satellite has released a map of the ee annihilation emission line of unprecedented quality, showing that most of the photons arise from a region coinciding with the stellar bulge of the Milky Way. The impressive intensity (≃ 10 photon cm s) and morphology (round and wide) of the emission is begging an explanation. Different classes of astrophysical ob...