• 分類 理論セミナー
  • 開始 2017/01/24(火)11:00
  • 終了 2017/01/24(火)12:00
  • 会場 Kenkyu Honkan 1F Meeting Room 3
  • 講演タイトル Cosmological constraints on dark matter annihilation and decay
  • 講演者 Dr. Naoki Yoshida (Tokyo Univ.)
  • 言語 英語/English
  • 連絡先 Kei Yamamoto/
  • ウェブサイト
  • 食堂・売店 利用予定なし/0



We present the results from cross-correlation analysis of weak gravitational lensing and the extra-galactic gamma-ray radiation. The former provides the large scale distribution of dark matter, and the latter possibly includes high energy photons produced by dark matter self-annihilation or decay. We use data from CFHT, SDSS, RCSLens galaxy surveys and the Fermi all-sky survey. We generate a large set of full-sky mock catalogs from cosmological N-body simulations and use them to estimate statistical errors accurately. The measured cross-correlation is consistent with null detection, which is then used to place strong cosmological constraints on annihilating and decaying DM. For leptophilic DM, the constraints are improved by a factor of 100 in the mass range of ~TeV when including contributions from secondary gamma-rays due to the inverse -Compton upscattering of background photons. Annihilation cross sections of 10^{-23} cm3/s are excluded for TeV-scale DM. Lifetimes of 10^25 sec are also excluded for the decaying TeV-scale DM. These are real cosmological constraints, rather than being obtained from local structures.