KEK 素粒子原子核研究所・理論セミナー(江間陽平氏)

カテゴリ理論セミナー
開始2020/06/30(火)16:00
終了2020/06/30(火)17:00
会場オンライン(Zoom)
講演タイトルHiggs inflation, unitarity, and emergence of scalaron
講演者江間陽平/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/0

概要

The Higgs inflation introduces a large non-minimal coupling between the Ricci scalar and Higgs that causes tree-level unitarity violation well below the Planck scale. After reviewing the unitarity issue during and after inflation, we show that the unitarity can be restored by summing over vacuum polarization-type diagrams. The scattering amplitude develops a pole after the resummation, which we identify as the scalar component of the metric, or the scalaron. It suggests that the Higgs inflation is actually a multi-field inflation model, i.e. Higgs and the scalaron, and does not suffer from the unitarity issue. We also show that this phenomenon can be understood in the language of the non-linear sigma model (NLSM), with the scalaron identified as the sigma field that linearizes the NLSM.

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