2011/12/22 by Yupeng Yang, Lei Feng, Xiaoyuan Huang +5 · 2 citations
Physics and Astronomy · #Anisotropy #Annihilation #Astrophysics #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Electroweak interaction #Fermi Gamma-ray Space Telescope #Gamma ray #Particle physics #Particle physics theoretical and experimental studies #Physics #Scalar field dark matter #Weakly interacting massive particles #astro-ph.CO
paper · pdf · doi:10.1088/1475-7516/2011/12/020
published as JCAP12(2011)020 · 13 pages, 4 figures, 1 table
openalex publication_date 2011/12/22 · arxiv created 2011/12/29 · arxiv updated 2011/12/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
It has been proposed that ultracompact minihalos (UCMHs) might be formed in earlier epoch. If dark matter consists of Weakly Interacting Massive Particles (WIMPs), UCMHs can be treated as the γ-ray sources due to dark matter annihilation within them. In this paper, we investigate the contributions of UCMHs formed during three phase transitions (i.e., electroweak symmetry breaking, QCD confinement and e + e − annihilation) to the extragalactic γ-ray background. Moreover, we use the Fermi-LAT observation data of the extragalactic γ-ray background to get the constraints on the current abundance of UCMHs produced during these phase transitions. We also compare these results with those obtained from Cosmic Microwave Background (CMB) observations and find that the constraints from the Fermi-LAT are more stringent than those from CMB.