2019/09/30 by Kimberly K. Boddy, Jason Kumar, Andrew B. Pace +2
Mathematics · Physics and Astronomy · #Annihilation #Astrophysics #Cosmology and Gravitation Theories #Coulomb #Dark Matter and Cosmic Phenomena #Dark matter #Galaxy #Mathematical analysis #Mathematical physics #Mathematics #Milky Way #Omega #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Relative velocity #Section (typography) #Sigma #Upper and lower bounds #astro-ph.CO #astro-ph.GA #hep-ph
paper · pdf · doi:10.1103/physrevd.102.023029
published as Phys. Rev. D 102, 023029 (2020) · v3: Fix minor formatting issues. v2: Accepted to PRD with minor changes. 13 pages, 6 figures, 1 table
openalex publication_date 2020/07/24 · openalex created_date 2020/07/29 · arxiv created 2020/07/31 · arxiv updated 2020/08/04 · openalex updated_date 2026/08/06
We calculate the effective J-factors, which determine the strength of indirect detection signals from dark matter annihilation, for 25 dwarf spheroidal galaxies (dSphs). We consider several well-motivated assumptions for the relative velocity dependence of the dark matter annihilation cross section: \ensuremathσAv: s-wave (velocity independent), p-wave (\ensuremathσAv\ensuremath∝v2), d-wave (\ensuremathσAv\ensuremath∝v4), and Sommerfeld-enhancement in the Coulomb limit (\ensuremathσAv\ensuremath∝1/v). As a result we provide the largest and most updated sample of J-factors for velocity-dependent annihilation models. For each scenario, we use Fermi-LAT gamma-ray data to constrain the annihilation cross section. Due to the assumptions made in our gamma-ray data analysis, our bounds are comparable to previous bounds on both the p-wave and Sommerfeld-enhanced cross sections using dSphs. Our bounds on the d-wave cross section are the first such bounds using indirect detection data.