KEK 素粒子原子核研究所・理論セミナー(谷崎佑弥氏)

カテゴリ理論セミナー
開始2020/06/16(火)11:00
終了2020/06/16(火)12:00
会場Online (Zoom)
講演タイトルModifying instanton sums in QCD
講演者谷崎佑弥(京都大学基礎物理学研究所)
言語英語/English
連絡先畠山洸太/khat-AT-post.kek.jp
ウェブサイト
食堂・売店利用予定なし/0

概要

In the path integral formulation, we need to sum up all possible field configurations to define a QFT. If the configuration space is disconnected, we must specify how they should be summed by giving extra data to specify the QFT. In this talk, we try to restrict the possible number of instantons in SU(N) gauge theories, Yang-Mills theory and QCD, and we find out the vacuum structures of them. For consistency with locality, we have to introduce an extra topological degrees of freedom, and the theory acquires the 3-form symmetry. The existence of this 3-form symmetry leads to extra vacua/universes, and moreover it turns out to give a stronger version of superselection rule for the domain-wall excitation/vacuum decay.

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