Phenomenological studies of axion and CP violation

2018 Fiscal Year Final Research Report

• Project/Area Number: 17K14303
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Waseda University
• Principal Investigator: Otsuka Hajime 早稲田大学, 理工学術院, 助教 (80777988)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Keywords: アクシオン / CP対称性の破れ / 超弦理論

Outline of Final Research Achievements

We studied phenomenological aspects of axions, which appear in the low-energy effective action of string theory. We focused on the axion originating from the internal space, appearing in Yukawa couplings among elementary particles, rather than the gauge coupling of the standard model. We have proposed a new mechanism to generate the baryon asymmetry induced by the axion dynamics and stabilization mechanism of the axion.

Free Research Field

素粒子理論

Academic Significance and Societal Importance of the Research Achievements

素粒子統一理論の候補である超弦理論の有効理論には、アクシオン場は不変的に現れる。本研究では、超弦理論由来のアクシオン場の中でも、特にCP対称性の破れを担うアクシオン場に注目した。本研究課題は、プランク衛星を初めとする宇宙論観測とLHC実験を初めとする加速器実験の双方において、アクシオン探索の研究分野を開拓する学術的意義を持つ。