2013/12/13 by Sheldon Campbell, Sheldon S. Campbell, J. F. Beacom +3 · 1 citation
Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #Atomic and Subatomic Physics Research #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle Detector Development and Performance #astro-ph.CO #astro-ph.GA #astro-ph.HE #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.1312.3945
6 pages, 2 figures. Supplementary Material is available in the ancillary files
arxiv created 2013/12/13 · openalex publication_date 2013/12/13 · arxiv updated 2013/12/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Searches for dark matter annihilation signals in the diffuse gamma-ray background are promising. We present the first comprehensive study utilizing both flux and anisotropy, using the example of a spectral line signal. Besides improving sensitivity, a combined analysis will help separately determine the particle properties of dark matter and the cosmological aspects of its clumping into halo substructure. The significance of a signal in a shot-noise-dominated anisotropy analysis increases linearly with time t, as opposed to √(t) for a flux analysis, so a flux hint might be confirmed with an anisotropy signal. A first combined line search with Fermi-LAT would provide powerful new sensitivity; one with the proposed GAMMA-400 would be dramatically better.