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ワークショップ 開催中
Condensed Matter Physics of QCD 2024
2024年3月11日(月) - 22日(金)
ゴードン・ベイム (Professor Emeritus, University of Illinois, USA)
新田 宗土 (慶応義塾大学 教授)
Mark Alford (Professor, Washington University in St. Louis, USA)
Sanjay Reddy (Professor, University of Washington, USA)
Dam Thanh Son (Professor, The University of Chicago, USA)
Mikhail Stephanov (Professor, The University of Illinois at Chicago (UIC), USA)
福嶋 健二 (東京大学 大学院理学系研究科 物理学専攻 教授)
山本 直希 (慶応義塾大学)
久德 浩太郎 (京都大学 大学院理学研究科 准教授)
林 優依 (京都大学 基礎物理学研究所)
西村 健太郎 (広島大学)
古城 徹 (東北大学)
北沢 正清 (京都大学 基礎物理学研究所)QCD at finite temperature and density is one of the most challenging problems in modern physics, which plays a crucial role to understand the origin and coevolution of the universe and matter. On the one hand, the relativistic heavy-ion collision experiments in the past decades have opened a new and exciting field to explore physical properties of such a QCD matter at high-tempearture. On the other hand, recent astrophysical observations of compact stars (in particular, events involving neutron stars) is becoming another exciting tool to unveil properties of the dense QCD matter. This molecule-type workshop is aimed at bringing together theorists working on QCD at finite-temperature and density, with a particular focus on dense quark-nuclear matter relevant to neutron star physics. We will mainly cover macroscopic properties of the finite-density QCD matter such as the Lee-Yang edge singularity for a QCD critical point, the renewed Fermi liquid theory for quark-nuclear matter, nuclear superfluidity, color superconductivity, quark-hadron continuity, quantum vortex, and transport phenomena including the weak-intearction processes.
会場: via Zoom / 京都大学基礎物理学研究所
イベント公式言語: 英語
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セミナー
Multimessenger probes of superheavy dark matter decay and annihilation
2024年3月26日(火) 10:18 - 11:00
Saikat Das (京都大学 基礎物理学研究所 ポスドク研究員)
We revisit constraints on decaying very heavy dark matter (VHDM) using the latest ultrahigh-energy cosmic-ray (UHECR; E >1e18 eV) data and ultrahigh-energy (UHE) gamma-ray flux upper limits, measured by the Pierre Auger Observatory. We present updated limits on the VHDM lifetime for masses up to ∼ 1e15 GeV, considering decay into quarks, leptons, and massive bosons. In particular, we consider not only the UHECR spectrum but their composition data that favors heavier nuclei. Such a combined analysis improves the limits at <1e12 GeV because VHDM decay does not produce UHECR nuclei. We also show that the constraints from the UHE gamma-ray upper limits are ∼ 10 times more stringent than that obtained from cosmic rays, for all of the Standard Model final states we consider. The latter improves our limits to VHDM lifetime by a factor of two for dark matter mass >1e12 GeV. We also provide constraints using neutrino flux from dark matter decay, including the neutrino-induced cascades. We consider the interaction of UHE neutrinos with the cosmic neutrino background, leading to the attenuation of the extragalactic flux reaching Earth, which improves our analysis to obtain tighter constraints.
会場: via Zoom
イベント公式言語: 英語
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セミナー
Arrhythmic activity rhythms in ants
2024年3月26日(火) 16:00 - 17:00
藤岡 春菜 (岡山大学 環境生命自然科学学域 助教)
Most organisms exhibit a periodic activity of about 24 h. This circadian rhythm is considered to be an adaptation to the fluctuations of the environment. In social insects such as honeybees and ants, individual behavior, including activity-rest rhythms, is influenced by interactions within the colony. However, it is challenging to monitor individual activity-rest rhythms in an ant colony due to their large group size and small body size. To address this, we developed an image-based tracking system using 2D barcodes a monomorphic ant and measured the locomotor activities of all colony members under laboratory conditions. Activity-rest rhythms appeared only in isolated ants, not under colony conditions. This suggests that a mixture of social interactions, not light and temperature, induces the loss of activity-rest rhythms. These findings contribute to our understanding of the diverse patterns of circadian activity rhythms in social insects.
会場: via Zoom
イベント公式言語: 英語
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特別講演会
京都大学SACRA-理化学研究所iTHEMS 特別講演会「逆撫での力学」
2024年3月28日(木) 13:30 - 16:30
時枝 正 (Professor, Department of Mathematics, Stanford University, USA)
摩擦、滞り、つっかえ、・・・ これらはさまざまな過程のはかどりを死なせてしまう邪魔者として嫌われがち。ところがこの講演では、あまたの実験をその場でおこない、これらが生むちょっと魔法じみた現象をご覧に入れます。そして最大限多様な現象を、最小限のモデルで解明しましょう。実験のいくつかはご自宅でも簡単に「手品」として楽しめるものです。 会場の収容人数の関係上、参加可能定員は約45名となります。定員に達し次第、受付を終了いたします。 プログラム: 13:00:開場・受付開始 13:30〜15:00:講演「逆撫での力学」 15:00〜16:30:継続討論 主催: 京都大学大学院理学研究科附属サイエンス連携探索センター(SACRA)学際融合部門 理化学研究所 数理創造プログラム(iTHEMS)
会場: 京都大学東京オフィス 大会議室
イベント公式言語: 日本語
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特別講演会
TadaFest 2024: Toward understanding of the Origin of Spacetime
2024年4月2日(火) 14:00 - 18:00
多田 司 (数理創造プログラム コーディネーター / 数理創造プログラム 副主任研究員)
Program 14:00-14:05 Welcome address T. Hatsuda (RIKEN iTHEMS) 14:05-15:35 T. Tada (RIKEN iTHEMS) "Toward understanding of the origin of spacetime" (This talk is in English) 15:35-16:00 coffee break 16:00-16:30 Shin Nakamura (Chuo Univ.) title: TBA (This talk is in Japanese) 16:30-17:00 Kinya Oda (Tokyo Woman's Chiristian Univ.) title: TBA (This talk is in Japanese) 17:00-17:30 Gen Tatara (RIKEN, CEMS) title: TBA (This talk is in Japanese) 17:30-18:00 Asato Tsuchiya (Shizuoka Univ.) title: TBA (This talk is in Japanese) 18:15- informal discussion @ Common space on 3F of the main research building
会場: 大河内記念ホール (メイン会場) / via Zoom
イベント公式言語: 英語
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コロキウム
第25回 MACSコロキウム・2024年度MACS学生説明会
2024年4月19日(金) 14:45 - 18:30
森田 航 (国立科学博物館 人類研究部 研究員 / 東京大学 大学院理学系研究科 生物科学専攻 准教授)
14:45-15:00 ティータイムディスカッション 15:00-16:00 森田 航 博士(国立科学博物館人類研究部 研究員 兼 東京大学大学院理学系研究科生物科学専攻 准教授)「歯の人類学:歯の形の違いが語ること」 16:15-17:20 2024年度MACS学生説明会 17:30-18:30 継続討論会
会場: 京都大学 北部総合教育研究棟 1階 益川ホール
イベント公式言語: 日本語
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ワークショップ
Recent Developments and Challenges in Topological Phases
2024年6月3日(月) - 14日(金)
Thanks to intensive research efforts, topology has been established as a fundamental concept in physics. For closed quantum systems, the classification of gapped topological phases has matured. Moreover, the importance of topology is not limited to isolated quantum systems. Recently, the topology of non-Hermitian Hamiltonians, which effectively describe systems with dissipation, has attracted much attention worldwide. This fascination is exemplified by topological phases and topological phenomena unique to non-Hermitian systems. Against this background, the primary purpose of this workshop is to bring together researchers working on topological phases and to discuss (i) open questions in topological phases of closed quantum systems and (ii) the role of topology in open quantum systems and measurements.
会場: 京都大学基礎物理学研究所
イベント公式言語: 英語