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今後2週間の予定

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※下記のセミナーの他に新着論文紹介のセミナー(10:00-10:30)が、月曜日、水曜日、金曜日にあります。場所は4号館ピロティです。

2021-01-28 (木) 宇宙物理学セミナー
    UTAPwiki/セミナー/宇宙物理学セミナー Speaker: Naoto Kuriyama

2021-02-01 (月) 初期宇宙・相対論速報
    UTAPwiki/セミナー/初期宇宙・相対論速報 Dynamically assisted Schwinger effect † ↑Yusuke Yamada † Schwinger pair production in electric field background is one of the most well-known non-perturbative effects in quantum field theory. Its non-perturbative nature typically leads to an exponentially small production rate, like tunneling in quantum mechanics.
    In this seminar, I will review “dynamically assisted Schwinger effect” where a “perturbative” weak electric field significantly enhances the “non-perturbative” production rate caused by a strong field. This is a very interesting example of interplay between perturbative and non-perturbative effects, and similar mechanism may work in other contexts such as cosmology. In order to describe the mechanism quantitatively, we have two options, WKB formalism and "world line instanton" method. Although the latter method seems not common in our (cosmology?) group, it gives an interesting description of how perturbative corrections affect non-perturbative pair production. So I will give a brief review of the world line method and discuss the dynamically assisted Schwinger mechanism with such a formalism.
    If (and only if) I have time, I will also discuss the dynamical assist mechanism with WKB formalism. Refs:
    R. Schutzhold, H. Gies, G. V. Dunne, Phys.Rev.Lett. 101 (2008) 130404,
    G.V. Dunne, C. Schbert, Phys.Rev.D 72 (2005) 105004,
    G. Torgrimsson, et al. JHEP 06 (2017) 043
    G. Torgrimsson, Phys.Rev.D.99.096002 …etc.

2021-02-04 (木) 宇宙物理学セミナー
    UTAPwiki/セミナー/宇宙物理学セミナー Speaker: Koh Ueno


セミナー週間予定

10111213141516
新着論文@ピロティ観測的宇宙論速報初期宇宙・相対論速報
新着論文@ピロティ
ランチセミナー昼食会宇宙物理学セミナー
新着論文@ピロティ天体核セミナー


UTAPゼミ週間予定

10111213141516
4年生理論演習



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