Lepton Number of Cosmic Background Neutrinos and Generation Mechanism of Particle Number in the Universe

• Project/Area Number: 17K05418
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Hiroshima University
• Principal Investigator: Morozumi Takuya 広島大学, 先進理工系科学研究科(理), 准教授 (20253049)
• Project Period (FY): 2017-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: マヨラナニュートリノ / レプトン数 / 宇宙背景ニュートリノ / ディラックニュートリノ / マヨラナ位相 / ニュートリノの絶対質量 / 背景ニュートリノ / 時間発展 / シーソー模型 / 粒子数反粒子数生成 / CPの破れ / 物質 反物質 / 粒子数反粒子数非対称性 / フレーバー混合 / 粒子反粒子混合 / 標準模型を超える理論 / 非平衡の場の量子論 / 密度行列 / 素粒子論

Outline of Final Research Achievements

We derive the time evolution of the lepton numbers for neutrinos which is valid from the relativistic case to non-relativistic case. The time evolution depends on the type of neutrino mass. The lepton numbers oscillate and its sign changes from the initial values for the Majorana neutrinos. The behavior is distinct from the Dirac neutrinos where the sign does not change from its initial values. We also find the time evolution depends on the absolute mass of neutrinos as well as CP violating phases including Majorana phases. The findings provide us with the useful information for observation of the cosmic neutrino background of the temperature as low as 2K. The temperature is comparable with the tiny neutrino masses.

Academic Significance and Societal Importance of the Research Achievements

宇宙背景ニュートリノは中間子やミューオン等の崩壊で作られるニュートリノと異なり、その運動エネルギーが極めて小さい。本研究ではニュートリノの静止エネルギー（質量）より運動エネルギーが小さいニュートリノに焦点をあて、その性質を場の量子論の枠組みで明らかにした。マヨラナニュートリノの場合、レプトン数の時間変化はニュートリノの絶対質量やマヨラナニュートリノに特徴的なマヨラナ位相と呼ばれるCP対称性の破れに依存する。これらのまだ測定されていない物理量の測定や極めて低い温度をもって宇宙に存在しているとされる宇宙背景ニュートリノの観測に必要なニュートリノの性質を明らかにした。

Research Products

• [Int'l Joint Research] 国立研究革新庁(BRIN)(インドネシア)
• [Int'l Joint Research] 国立トムスク教育大学(ロシア連邦)
• [Int'l Joint Research] トムスク国立教育大学(ロシア連邦)
• [Int'l Joint Research] インドネシア科学院（LIPI)(インドネシア)
• [Int'l Joint Research] 国立トムスク教育大学(ロシア連邦)
• [Int'l Joint Research] 中央研究院(台湾）(その他の国・地域 台湾)
• [Int'l Joint Research] 国立トムスク教育大学(ロシア連邦)
• [Int'l Joint Research] 中央研究院(その他の国・地域 台湾)
• [Int'l Joint Research] Tomsk State Pedagogical University(ロシア連邦)
• [Journal Article] Lepton Family Numbers and Non-Relativistic Majorana Neutrinos (2021)
  • Author(s): Apriadi Salim Adam, Nicholas J Benoit, Yuta Kawamura, Yamato Matsuo, Takuya Morozumi, Yusuke Shimizu, Yuya Tokunaga, Naoya Toyota
  • Journal Title: Andromeda Proceedings Volume: -
  • DOI: 10.31526/acp.bsm-2021.29
  • Open Access / Int'l Joint Research
• [Journal Article] A model with light and heavy scalars in view of the effective theory (2021)
  • Author(s): Apriadi Salim Adam, Yuta Kawamura, Takuya Morozumi
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: Volume 2022 Issue: 1
  • DOI: 10.1093/ptep/ptab129
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Time evolution of Lepton Number carried by Majorana Neutrinos (2021)
  • Author(s): Apriadi Salim Adam, Nicholas Benoit, Y. Kawamura, T.Morozumi, et.al.
  • Journal Title: Progress of theoretical and experimental physics Volume: - Issue: 5
  • DOI: 10.1093/ptep/ptab025
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Hidden relations in three generation seesaw model with Dirac mass matrix of four-zero texture (2019)
  • Author(s): T. Morozumi, Yusuke Shimizu, Hiroyuki Umeeda, and Akihiro Yuu:
  • Journal Title: Physics Lett. B Volume: 799
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A New Mechanism for Generating Particle Number Asymmetry through Interactions (2019)
  • Author(s): Takuya Morozumi, Keiko I. Nagao, Apriadi Salim Adam, Hiroyuki Takata
  • Journal Title: Advances in High Energy Physics Volume: 2019 Pages: 1-28
  • DOI: 10.1155/2019/6825104
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Generation of particle number asymmetry in expanding universe (2019)
  • Author(s): Apriadi Salim Adam,Takuya Morozumi, Keiko I. Nagao, Hiroyuki Takata
  • Journal Title: 素粒子論研究電子版 Volume: 28
  • Open Access / Int'l Joint Research
• [Journal Article] Effective theory analysis for vector-like quark model (2018)
  • Author(s): Takuya Morozumi, Yusuke Shimizu, Shunya Takahashi, Hiroyuki Umeeda
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 4 Issue: 4 Pages: 1-24
  • DOI: 10.1093/ptep/pty042
  • Peer Reviewed / Open Access
• [Journal Article] Analysis of Dalitz decays with intrinsic parity violation (2018)
  • Author(s): Daiji Kimura, Takuya Morozumi, Hiroyuki Umeeda
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 12 Issue: 12
  • DOI: 10.1093/ptep/pty122
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Phenomenological aspects of possible vacua of a neutrino flavor model (2018)
  • Author(s): T. Morozumi, H.Okane, H.Sakamoto, Y.Shimizu, K. Takagi, H.Umeeda
  • Journal Title: Chinese Physics C Volume: 42 Issue: 2 Pages: 023102-023102
  • DOI: 10.1088/1674-1137/42/2/023102
  • Peer Reviewed / Open Access
• [Presentation] 有効理論を用いたベクターライククオークモデルのCPの破れ (2022)
  • Author(s): 両角卓也
  • Organizer: 日本物理学会 第77回年次大会
• [Presentation] Time evolution of Majorana neutrinos in the Schrodinger picture versus Heisenberg picture (2021)
  • Author(s): Takuya Morozumi
  • Organizer: CORFU SUMMER INSTITUTE , 21st HELENIC SCHOOL AND WORKSHOP ON ELEMENTARY PARTICLE PHYSICS AND GRAVITY, Workshop on the Standard Model and Beyond
  • Int'l Joint Research / Invited
• [Presentation] Time evolution of lepton number from relativistic regime to non-relativstic regime (2021)
  • Author(s): Takuya Morozumi
  • Organizer: Astroneutrino Theory Workshop 2021
  • Int'l Joint Research / Invited
• [Presentation] レプトン数の時間発展とマヨラナ位相依存性, ユニタリー三角形 (2021)
  • Author(s): 両角卓也
  • Organizer: 素粒子現象論研究会2021
• [Presentation] Time variation of Lepton Family Number of Majorana Neutrinos (2021)
  • Author(s): Takuya Morozumi, Apriadi Salim Adam, Nicholas J. Benoit, Yuta Kawamura, Yamato Matuo, Yusuke Shimizu, Yuya Tokunaga, and Naoya Toyota
  • Organizer: Beyond Standard Model: From Theory to Experiment(BSM 2021)
  • Int'l Joint Research / Invited
• [Presentation] Time evolution of Lepton Family Number of Majorana Neutrinos (2021)
  • Author(s): Takuya Morozumi, Apriadi Salim Adam, Nicholas J. Benoit, Yuta Kawamura, Yamato Matuo, Yusuke Shimizu, Yuya Tokunaga, and Naoya Toyota
  • Organizer: 7 th KEK-PH Lectures and Workshop on “Flavor”
• [Presentation] マヨラナニュートリノのレプトン数の時間発展 (2021)
  • Author(s): Takuya Morozumi, Apriadi Salim Adam, Nicholas J. Benoit, Yuta Kawamura, Yamato Matuo, Yusuke Shimizu, Yuya Tokunaga, and Naoya Toyota
  • Organizer: 日本物理学会 2021年春季大会
• [Presentation] Evolution of Lepton Number for Dirac Neutrinos in a Unified Framework (2021)
  • Author(s): Takuya Morozumi, Apriadi Salim Adam, Nicholas J. Benoit, Yuta Kawamura, Yamato Matuo, Yusuke Shimizu, and Naoya Toyota
  • Organizer: 日本物理学会 2021年春季大会
• [Presentation] ニュートリノ質量行列のくりこみ群の効果 (2021)
  • Author(s): Takuya Morozumi, Nicolas J. Benoit , Yusuke Shimizu, Kenta Takagi, Akihiro Yuu
  • Organizer: 日本物理学会 2021年春季大会
• [Presentation] Left-Right asymmetric model and flavor observables (2021)
  • Author(s): Takuya Morozumi, Kei Yamamoto, Yuta Kawamura, Yusuke Shimizu, Toyota Naoya, Syunya Takahashi, Apriadi Salim Adam
  • Organizer: 日本物理学会 2021年春季大会
• [Presentation] Lepton Number violation in a unified framework; Revised (2020)
  • Author(s): Takuya Morozumi, Apriadi Salim Adam, Nicholas J. Benoit, Yuta Kawamura, Yamato Matuo, Yusuke Shimizu, Yuya Tokunaga, and Naoya Toyota
  • Organizer: Flavor physics workshop 2020 (FPWS2020)
• [Presentation] SMEFT from Two Higgs doublet Model (2020)
  • Author(s): Takuya Morozumi, Yuta Kawamura, Apriadi Salim Adam
  • Organizer: Flavor physics workshop 2020 (FPWS2020)
• [Presentation] A Study of RG effects on a Textured Neutrino Mass matrix (2020)
  • Author(s): Takuya Morozumi, Nicolas J. Benoit , Yusuke Shimizu, Kenta Takagi, Akihiro Yuu
  • Organizer: 10th Internatinal Conference on Exact Renormalization Group 2020(ERG2020)
• [Presentation] マヨラナ質量を持つニュートリノのレプトンファミリー数の時間発展 (2020)
  • Author(s): Takuya Morozumi, Apriadi Salim Adam, Nicholas J. Benoit, Yuta Kawamura, Yamato Matuo, Yusuke Shimizu, Yuya Tokunaga, and Naoya Toyota
  • Organizer: 2020年度 新学術 地下宇宙領域研究会
• [Presentation] 有効理論を用いたTwo Higgs 模型の研究 (2020)
  • Author(s): Takuya Morozumi, Yuta Kawamura, Apriadi Salim Adam
  • Organizer: 日本物理学会 2020年秋季大会
• [Presentation] Lepton number violation in a unified framework (2020)
  • Author(s): Takuya Morozumi, Apriadi Salim Adam, Nicholas J. Benoit, Yuta Kawamura, Yamato Matuo, Yusuke Shimizu, Yuya Tokunaga, and Naoya Toyota
  • Organizer: Neutrino 2020
  • Int'l Joint Research
• [Presentation] A study of Renormalization Group Effects on the Mass of the Lightest Neutrinos (2020)
  • Author(s): Takuya Morozumi, Nicolas J. Benoit , Yusuke Shimizu, Kenta Takagi, Akihiro Yuu
  • Organizer: 10th Internatinal Conference on Exact Renormalization Group 2020 (ERG2020)
  • Int'l Joint Research
• [Presentation] マヨラナ質量による大きなレプトンファミリー数の生成 (2020)
  • Author(s): 両角卓也, ニコラス ジェームス ベンワ, 河村優太, 松尾大和, 清水勇介, アプリアディ サリム アダム, 豊田直哉
  • Organizer: 日本物理学会 2020年秋季大会
• [Presentation] Lepton Number violation in a unified framework; Revised (2020)
  • Author(s): Takuya Morozumi, Apriadi Salim Adam, Nicholas J. Benoit, Yuta Kawamura, Yamato Matuo, Yusuke Shimizu, Yuya Tokunaga, and Naoya Toyota
  • Organizer: The 1st IIT Bombay-Hiroshima workshop for Frontiers of Neutrino Physics
  • Int'l Joint Research
• [Presentation] A Study of Renormalization Group Effects on the Mass of the Lightest Neutrino (2020)
  • Author(s): Takuya Morozumi, Nicolas J. Benoit , Yusuke Shimizu, Kenta Takagi, Akihiro Yuu
  • Organizer: The 1st IIT Bombay-Hiroshima workshop for Frontiers of Neutrino Physics
  • Int'l Joint Research
• [Presentation] Dirac Neutrino Lepton number in a unified framework (2020)
  • Author(s): Takuya Morozumi, Apriadi Salim Adam, Nicholas J. Benoit, Yuta Kawamura, Yamato Matuo, Yusuke Shimizu, and Naoya Toyota
  • Organizer: The 1st IIT Bombay-Hiroshima workshop for Frontiers of Neutrino Physics
  • Int'l Joint Research
• [Presentation] Initial Time Renormalization of a Non-Equilibrium Effective Field Theory (2020)
  • Author(s): Takuya Morozumi, Nicholas J. Benoit, Keiko Nagao, Takata Hiroyuki
  • Organizer: The 1st IIT Bombay-Hiroshima workshop for Frontiers of Neutrino Physics
  • Int'l Joint Research
• [Presentation] Effective Action model for two Higgs doublet model with small Dirac Neutrino mass (2020)
  • Author(s): Takuya Morozumi, Yuta Kawamura, Apriadi Salim Adam
  • Organizer: The 1st IIT Bombay-Hiroshima workshop for Frontiers of Neutrino Physics
  • Int'l Joint Research
• [Presentation] マヨラナニュートリノによるレプトン数の破れの時間発展 (2020)
  • Author(s): 両角 卓也, 清水勇介, 河村優太, 松尾大和, アプリアディ サリム アダム,徳永裕也 , 豊田直哉
  • Organizer: 日本物理学会
• [Presentation] Two Higgs 模型の低エネルギー有効作用と現象論 (2020)
  • Author(s): 両角 卓也 河村 優太
  • Organizer: 日本物理学会
• [Presentation] Lepton Number Violation in a Unified Framework (2019)
  • Author(s): Takuya Morozumi, Y. Kawamura, Y. Matsuo, Apriadi Salim Adam, Y. Shimizu, Y.Tokunaga, N. Toyota
  • Organizer: PACIFIC 2019, Particle Astrophysics and Cosmology Including Fundamental Interactions
  • Invited
• [Presentation] Lepton Number Violation in a Unified Framework (2019)
  • Author(s): Takuya Morozumi, Y. Kawamura, Y. Matsuo, Apriadi Salim Adam, Y. Shimizu, Y.Tokunaga, N. Toyota
  • Organizer: Higgs and Flavour Today (GUIFEST)
  • Invited
• [Presentation] Lepton Number Violation in a Unified Framework (2019)
  • Author(s): 両角 卓也, 河村優太, 松尾大和, アプリアディ サリム アダム, 清水勇介,徳永裕也 , 豊田直哉
  • Organizer: Flavor Physics Workshop 2019
• [Presentation] Particle Number Asymmetry of the early universe (2018)
  • Author(s): Takuya Morozumi
  • Organizer: 5th International Workshop on Dark Matter, Dark Energy and Matter-Antimatter Asymmetry
  • Int'l Joint Research / Invited
• [Presentation] Neutrino Physics and CP violation in three generation seesaw model with four-zero texture (2018)
  • Author(s): Akihiro Yuu, Takuya Morozumi, Yusuke Shimizu, Hiroyuki Umeeda
  • Organizer: 7th Workshop on Flavour Symmetries and Consequences in Accelerators and Cosmology
  • Int'l Joint Research
• [Presentation] Generation of particle number asymmetry in an expanding universe; a novel mechanism (2018)
  • Author(s): Apriadi Salim Adam
  • Organizer: Phenomenology of Particle and Anti-Particle 2018
  • Int'l Joint Research
• [Presentation] The creation of particle number asymmetry of universe with arbitrary time dependent scale factor using perturbation method (2017)
  • Author(s): Apriadi Salim Adam
  • Organizer: Summer Institute 2017
• [Presentation] Time evolution of lepton number of the cosmic background neutrino (2017)
  • Author(s): Takuya Morozumi
  • Organizer: Setouchi Summer Institute
• [Presentation] 有効理論を用いた vector like クォーク模型に対するB中間子稀 崩壊からの制限 (2017)
  • Author(s): 高橋 隼也
  • Organizer: 瀬戸内サマーインスティチュート
• [Presentation] vector like クォークに対するB中間子稀崩壊からの制限 (2017)
  • Author(s): 高橋 隼也
  • Organizer: 日本物理学会 2017年秋季大会
• [Presentation] vector likeクォークに対するB中間子稀崩壊からの制限 (2017)
  • Author(s): 高橋 隼也
  • Organizer: Flavor Physics Workshop 2017
• [Presentation] CP violation and leptogenesis in three generation seesaw model with four-zero textures (2017)
  • Author(s): 由宇 朗大
  • Organizer: Setouchi Summer Institute 2017
• [Presentation] CP violation and leptogenesis in three generation seesaw model with four-zero textures (2017)
  • Author(s): 由宇 朗大
  • Organizer: Summer Institute 2017
• [Remarks] workshop for Frontiers of Neutrino Physics
  • URL: https://home.hiroshima-u.ac.jp/morozumi/IITBHiroshimaNEUTRINO2020.html
• [Remarks] マヨラナニュートリノが運ぶレプトン数の新たな公式
  • URL: https://adse.hiroshima-u.ac.jp/?p=2120
• [Remarks] マヨラナニュートリノの質量行列の隠れた関係式
  • URL: https://adse.hiroshima-u.ac.jp/?p=761
• [Remarks] https:/home.hiroshima-u.ac.jp/morozumi/ppapo.html
• [Remarks]
  • URL: http://home.hiroshima-u.ac.jp/morozumi/ppapo.html
• [Funded Workshop] Phenomenology for Particle and Anti-Particle 2018 (2018)