研究者詳細 - 田尾　周一郎

論文 - 田尾　周一郎

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Saddle-Point Approximation to the False-Vacuum Decay at Finite Temperature in 1D Quantum Mechanics 査読

Koji Harada, Shuichiro Tao, Qiang Yin

Progress of Theoretical and Experimental Physics 2025 ( 1 ) 2025年1月

掲載種別：研究論文（学術雑誌）出版者・発行元：Oxford University Press (OUP)

Abstract

We calculate the false-vacuum decay rate in 1D quantum mechanics on the basis of the saddle-point approximation in the Euclidean path integral at finite temperature. The saddle points are the finite-T and shifted bounce solutions, which are finite-period analogs of the (zero-temperature) bounce solution, and the shot solutions. We reexamine the zero-temperature result by Callan and Coleman and compare it with the zero-temperature limit of our results. We also perform some numerical calculations to illustrate the temperature dependence of the decay rate and compare it with the result by Affleck.

DOI： 10.1093/ptep/ptaf001

arXiv

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その他リンク： https://academic.oup.com/ptep/article-pdf/2025/1/013A01/61371559/ptaf001.pdf

ラウンドテーブル報告学士課程における研究体験の教育的意義を再考する査読

田中岳, 田尾周一郎, 宮浦崇, 新谷恭明

大学教育学会誌 42 ( 2 ) 98 - 102 2020年12月

「課題研究」科目における早期の研究体験の意義について : 「学際」系学士教育課程への示唆査読

田尾周一郎, 田中岳, 飯嶋裕治, 副島雄児

基幹教育紀要 ( 6 ) 51 - 63 2020年3月

総合的且つ多面的な評価に基づく入学者選抜とその学修成果の可視化ー九州大学21世紀プログラムの事例ー査読

木村拓也, 田尾周一郎, 林篤裕, 副島雄児

名古屋高等教育研究 ( 18 ) 177 - 198 2018年3月

力学基礎での受講生の理解度の進展査読

副島雄児, 鹿田憲秀, 小島健太郎, 田尾周一郎

日本物理教育学会誌 64 ( 1 ) 57 - 61 2016年3月

21世紀プログラム学生の修学動向査読

田尾周一郎

基幹教育紀要 2 27 - 35 2016年

記述言語：日本語出版者・発行元：九州大学基幹教育院

Kyushu University has an honors program named 21st century program. Students of the program are permitted that they can choose academic courses freely. In this paper we consider their learning behavior. First, we give an overview of their learning behavior based on four-years school records of the students who entered university from 2009 to 2011. Next, we show in detail their course selection from fundamental-natural-science courses, because it indicates a characteristic result, that is exponential growth of credits. We discuss the result based on a student data who entered from 2009 to 2013. Finally, we present student attendance and participation state to Combined Tutorial by which we consider a problem for grasping student's learning and growth nature those are difficult to extract from school records.

DOI： 10.15017/1650897

CiNii Article

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その他リンク： http://hdl.handle.net/2324/1650897

21世紀プログラムの10年査読

林篤裕, 副島雄児, 田尾周一郎, 武谷峻一

大学入試研究ジャーナル 22 155 - 161 2012年3月

27aSJ-13 NMSSMにおける有限温度スファラロン(素粒子論領域)

船久保公一, 角藤亮, 田尾周一郎, 豊田文彦

日本物理学会講演概要集 62.1.1 8 2007年

Sphalerons in the NMSSM 査読

K Funakubo, A Kakuto, S Tao, F Toyoda

PROGRESS OF THEORETICAL PHYSICS 114 ( 5 ) 1069 - 1082 2005年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE

We study sphaleron solutions in the next-to-minimal supersymmetric standard model. We find that the boundary condition on the singlet field at the origin of the radial coordinate is of Neumann type, while the other boundary conditions are of Dirichlet type. The sphaleron energy takes almost the same value as in the MSSM for a wide range of parameter values, in spite of the negative contribution from the cubic term in the Higgs potential.

DOI： 10.1143/PTP.114.369

Web of Science

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Phase transitions in the NMSSM 査読

K Funakubo, S Tao, F Toyoda

PROGRESS OF THEORETICAL PHYSICS 114 ( 2 ) 369 - 389 2005年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE

We study phase transitions in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) with the weak scale vacuum expectation values of the singlet scalar, constrained by Higgs spectrum and vacuum stability. We find four different types of phase transitions, three of which have two-stage nature. In particular, one of the two-stage transitions admits strongly first order electroweak phase transition, even with heavy squarks. We introduce a tree-level explicit CP violation in the Higgs sector, which does not affect the neutron electric dipole moment. In contrast to the MSSM with the CP violation in the squark sector, a strongly first order phase transition is not so weakened by this CP violation.

DOI： 10.1143/PTP.114.369

Web of Science

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The Higgs sector in the next-to-MSSM 査読

K Funakubo, S Tao

PROGRESS OF THEORETICAL PHYSICS 113 ( 4 ) 821 - 842 2005年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE

We study the Higgs sector in the next-to-minimal supersymmetric standard model both with and without explicit CP violation, focusing on the case of a weak-scale expectation value of the singlet field. We scan a wide range of the parameter space to determine allowed regions by requiring that the electroweak vacuum be the global minimum of the effective potential and that, the neutral Higgs bosons with moderate gauge coupling be heavier than the lower bound on the Higgs boson in the standard model. Among the allowed sets of parameter values, some sets yield the situation in which the light Higgs bosons couple with the Z boson too weakly for observation to be possible in present collider experiments. For such parameter sets, we determine an upper bound on the charged Higgs mass that is attainable in LHC.

DOI： 10.1143/PTP.113.821

Web of Science

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24aXE-14 NMSSMでの電弱相転移の次数とCPの破れ : Elcctrowcak Baryogcncsisは可能か(素粒子論)

船久保公一, 角藤亮, 豊田文彦, 田尾周一郎

日本物理学会講演概要集 60.1.1 1 2005年

24aXE-13 Sphalerons in the Next-to-MSSM

船久保公一, 角藤亮, 田尾周一郎, 豊田文彦

日本物理学会講演概要集 60.1.1 1 2005年

CP violation in the Higgs sector and a phase transition in the MSSM 査読

K Funakubo, S Tao, F Toyoda

PROGRESS OF THEORETICAL PHYSICS 109 ( 3 ) 415 - 432 2003年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE

We investigate the electroweak phase transition in the presence of a large CP violation in the squark sector of the MSSM. When the CP violation is large, scalar-pseudoscalar mixing of the Higgs bosons occurs, and a large CP violation in the Higgs sector is induced. It, however, weakens the first-order phase transition before the mixing reaches its maximal level. Even when the CP violation in the squark sector is not so large that the phase transition is strongly first order, the phase difference between the broken and symmetric phase regions grows to O(1), which leads to successful baryogenesis when the charged Higgs bosons are light.

DOI： 10.1143/PTP.109.415

Web of Science

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31pSF-9 予加熱における欠陥形成と CP の破れ

船久保公一, 角藤亮, 大槻昭一郎, 田尾周一郎, 豊田文彦

日本物理学会講演概要集 58.1.1 18 2003年

24aXH-3 欠陥形成による電弱バリオン生成

船久保公一, 角藤亮, 大槻昭一郎, 田尾周一郎, 豊田文彦

日本物理学会講演概要集 57.1.1 1 2002年

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