2019/12/23 by Sandeep Kumar Acharya, Acharya, Sandeep Kumar, Rishi Khatri +1 · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #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 - Phenomenology (hep-ph)
paper · pdf · doi:10.48550/arxiv.1912.10995
openalex publication_date 2019/12/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We calculate the spectral distortions from Hawking evaporation of primordial\nblack holes before the epoch of recombination, taking into account emission of\nall standard model particles, including quark and gluons, and evolving the\nresulting particle cascades in the expanding Universe. We show that the\nconstraints on the abundance of primordial black holes are stronger by more\nthan an order of magnitude compared to the previous calculations which take\nonly the primary photon emission into account. We also show that the shapes of\nthe spectral distortions is different from the y or i-type distortions and\nare sensitive to the mass of the primordial black holes. We also extend\nprevious constraints on the decay of long lived unstable particles before\nrecombination to additional decay channels. We show that for dark matter mass\n lesssim 1 GeV, the spectral distortion shape is a function of the dark\nmatter mass as well as the decay channel to standard model particles. We also\nprovide new spectral distortion constraints on superconducting cosmic string\ndecay. We explicitly show that consideration of emitted photon spectrum from\nstring decay is not only important for the future experiments but also for\nalready available COBE-FIRAS data.\n