KEK素粒子原子核研究所・理論セミナー/中間

 
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開始2015/10/14（水）14:00
終了2015/10/14（水）15:00
会場研究本館１階　会議室1
講演タイトルPrimordial black holes as a novel probe of primordial gravitational waves
講演者中間　智弘氏(東京大学)
言語英語/English
連絡先柴田三四郎/sshibata-AT-post.kek.jp
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食堂・売店利用予定なし／0

概要

（ABSTRACT）

We propose a novel method to probe primordial gravitational waves by means of primordial black holes (PBHs). When the amplitude of primordial tensor perturbations on comoving scales much smaller than those relevant to Cosmic Microwave Background is very large, it induces scalar perturbations due to second-order effects substantially. If the amplitude of resultant scalar perturbations becomes too large, then PBHs are overproduced to a level that is inconsistent with a variety of existing observations constraining their abundance. This leads to upper bounds on the amplitude of initial tensor perturbations on super-horizon scales. The resultant PBH upper bounds turn out be tighter than other bounds obtained from Big Bang Nucleosynthesis and Cosmic Microwave Background.

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