2024年
02/15
開催
開催日時
2024/02/15（木） 13:30～14:30
開催場所
ハイブリッド：研究本館 セミナールーム、オンライン(Zoom)
講演者
Dr. Arnab Chaudhuri (NAOJ)
言語
English
詳細ページ
お問い合わせ
伊藤 飛鳥 / asuka.ito-AT-kek.jp
概要
Particulate dark matter (DM), completely isolated from the Standard Model particle sector, can be produced in the early Universe from primordial black hole (PBH) evaporation. However, big bang nucleosynthesis (BBN) observations put an upper bound on the initial mass of PBH requiring the PBH to evaporate completely before the advent of BBN. DM particles in the mass range ∼(1–10^9)GeV cannot explain the observed relic abundance for an early matter dominated universe due to this BBN constraint. However, this assumes the presence of only one monochromatic PBH mass distribution in the early Universe. In this talk, we will explore the simple possibility of achieving the observed relic with DM masses from the above mentioned range for an early matter dominated era with two monochromatic evaporating PBH mass distributions and demonstrate that the fermionic DM masses consistent with BBN change slightly.