KEK 素粒子原子核研究所・宇宙物理セミナー(関口豊和氏)

カテゴリ理論セミナー
開始2020/07/09(木)12:30
終了2020/07/09(木)13:30
会場オンライン(Zoom)
講演タイトルEarly recombination meets closed Universe: more than a solution to the H0 tension
講演者関口豊和/KEK素粒子原子核研究所
言語英語/English
連絡先関口豊和/tsekiguc-AT-post.kek.jp
ウェブサイト
食堂・売店利用予定なし/0

概要

The discrepancy in measurements of H0 is the most notable anomaly in contemporary cosmology with significance as large as 6σ. Despite many attempts, there is yet no compelling solution to the H0 tension. In the first part of my talk, I review the H0 tension. In particular, I will clarify why it is so diffcult to solve the tension. In the latter part, I will present our model, which is based on modified recombination in a closed Universe. Starting from general discussion on necessary conditions that successful modified recombination models should satisfy to fit CMB observations, I will demonstrate time-varying me models indeed satisfy those conditions. To fit low-z distance measurements such as baryon acoustic oscillation and type-Ia supernovae, a positive spatial curvature plays an essential role. Compared to the canonical ΛCDM, our model improves the chi-square by more than 23. We also show our model solves the lensing anomaly in the Planck data concurrently.

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