2012 Fiscal Year Final Research Report
Study on lepto-genesis andlepton number violation with non-equilibrium quantum field theory
| Project/Area Number |
22540283
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Hiroshima University |
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Principal Investigator |
MOROZUMI Takuya 広島大学, 大学院・理学研究科, 准教授 (20253049)
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| Research Collaborator |
TAKATA Hiroyuki トムスク教育大学, 理論物理, 准教授
HOTTA Ryuichi 広島大学, 理学研究科, 博士課程後期 大学院生
KIMURA Daiji 近畿大学, 工学部, 非常勤講師
KANG Young Lee Gyeongsang National University, 物理教育, 教授
YOKOZAKI Norimi 東京大学, Kavli IPMU・日本学術振興会, 特別研究員
TAMAI Kotaro 広島大学, 理学研究科, 博士課程後期大学院生
KAWASAKI Ryomu 広島大学, 理学研究科, 博士課程前期大学院生
UMEEDA Hiroyuki 広島大学, 理学研究科, 博士課程前期大学院生
NAKAGAWA Keita 広島大学, 理学研究科, 博士課程前期大学院生
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| Project Period (FY) |
2010 – 2012
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| Keywords | 素粒子論 / 非平衡の場の理論 / シーソー模型 / レプトジェネシス / レプトン数 |
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| Research Abstract |
We study the generation and the time development of lepton number of universe. One can compute time evolution of the particle number using non-equilibrium quantum field theory. Assuming that the asymmetry of particle number and anti-particle number exists at initial time, we include the mass term which does not conserve the particle number. Then, particleand anti-particle oscillation occurs. In our calculation with quantum field theory, as time goes, the asymmetry shows damping oscillation behavior and does not return to the initial value. This phenomenon occurs because there are infinite numbers of the oscillation modes with variety of their periods in the quantum field theory calculation. This is a new discovery of the project related to the time evolution of lepton number of universe.
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