KEK 素粒子原子核研究所・理論セミナー(向田享平氏)

カテゴリ理論セミナー
開始2020/06/24(水)17:00
終了2020/06/24(水)18:00
会場オンライン(Zoom)
講演タイトルBaryogenesis from Axion Inflation
講演者向田享平/DESY
言語英語/English
連絡先千草颯/schigusa-AT-post.kek.jp
ウェブサイト
食堂・売店利用予定なし/0

概要

In inflation models driven by an axion-like particle, the inflaton may have a Chern-Simons coupling to the Standard Model (SM) U(1)Y. In this talk, we show that this setup is a highly predictive baryogenesis model without further ingredients other than the SM and the inflaton. During inflation, this Chern-Simons coupling sources a dual production of the SM chiral fermions and maximally helical U(1)Y gauge fields, associated with the SM chiral anomaly equation. The anomalous transport of these primordial chiral asymmetries and the helical U(1)_Y gauge fields after inflation gives rise to the present baryon asymmetry. The observed baryon asymmetry can be reproduced if the Hubble parameter of inflation is around Hinf ∼ 10^10 - 10^12 GeV with moderate dependence on inflation model parameters.

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