2005/07/31 by Lars Bergstrom, Lars Bergström, Torsten Bringmann +3 · 2 citations
Physics and Astronomy · #Annihilation #Astrophysics #Bremsstrahlung #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Fragmentation (computing) #Gamma ray #Neutralino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevlett.95.241301
published as Phys.Rev.Lett. 95 (2005) 241301 · 4 pages, 4 figures; revised to match published version
openalex publication_date 2005/12/08 · arxiv created 2005/12/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider the gamma-ray spectrum from neutralino dark matter annihilations and show that internal bremsstrahlung of pair final states gives a previously neglected source of photons at energies near the mass of the neutralino. For masses larger than about 1 TeV, and for present day detector resolutions, this results in a characteristic signal that may dominate not only over the continuous spectrum from W fragmentation, but also over the gammagamma and gammaZ line signals which are known to give large rates for heavy neutralinos. Observational prospects thus seem promising.