5月14日（火）13：30～15：00 太陽系小天体セミナー 南棟２階会議室
May 14 Tue Solar System Minor Body Seminar Conference Room, South Bldg.2F
5月15日（水）10:30～12:00 総研大コロキウム 講義室
May 15 Wed SOKENDAI colloquium Lecture Room
5月15日（水）13：30～15：00 科学研究部コロキウム 開発棟３号館３階会議室
May 15 Wed Colloquium of Division of Science Conference room, Instrument Development Bldg. 3 3F
5月17日（金）13：30～15：00 太陽天体プラズマセミナー 院生セミナー室
May 17 Fri Solar and Space Plasma Seminar Student Seminar Room, Subaru Bldg.
5月17日（金）16：00～17：00 国立天文台談話会 大セミナー室
May 17 Fri NAOJ Seminar Large Seminar Room
詳細は以下をご覧下さい。
5月14日（火）
- キャンパス
- 三鷹
- セミナー名
- 太陽系小天体セミナー
- 定例・臨時の別
- 定例
- 日時
- 5月14日（火曜日）13時30分～15時
- 場所
- 南棟２階会議室
- 連絡先
-
名前：渡部潤一
備考：テレビ会議またはスカイプによる参加も可
5月15日（水）
- Campus
- Mitaka
- Seminar
- SOKENDAI colloquium
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- May 15, 2019, 10:30 -12:00
- Place
- Lecture Room
- Speaker
- Masaki Yoshida
- Affiliation
- SOKENDAI 5th year (D3) (Supervisor: Yoshinori Suematsu, Hirohisa Hara, Ryohko Ishikawa)
- Title
- Linear Polarization in Lyman-α Solar Spicules Observed by CLASP
Abstract(Option): - Speaker
- Yuhang Zhao
- Affiliation
- SOKENDAI 4th year (D2) (Supervisor: Matteo Leonardi, Raffaele Flaminio, Ryutaro Takahashi)
- Title
- TBD
Abstract(Option): - Facilitator
- -Name： Kei Ito
- Comment
5月15日（水）
- キャンパス
- 三鷹
- セミナー名
- 科学研究部コロキウム
- 定例・臨時の別
- 定例
- 日時
- 5 月 15 日（水曜日）13 時 30分 ～ 15 時
- 場所
- Instrument Development Bldg. 3
- 講演者
- Kanji Mori
- 所属
- 東京大学, 国立天文台科学研究部
- タイトル
- Big Bang Nucleosynthesis with Time-dependent Quark Mass
- Abstract
- The standard Big Bang nucleosynthesis (BBN) model predicts primordial abundances of hydrogen, helium and lithium which are in reasonable agreement with astronomical observations except for 7Li. Recent precise reanalysis of an absorption system along the line-of-sight toward high redshift quasar Q1243+307 has placed tighter observational constraint on the primordial abundance of deuterium. Comparing this observational result with the theoretical prediction allows us to explore possible beyond-standard physics. In particular, the BBN is sensitive to quark mass variations because they change nuclear binding energies. The effect of the quark mass variations on the BBN has been studied, but it was the case ignoring the roles of the 7Be(n, p)7Li resonant reaction which is known to affect the primordial abundance of 7Be. In this talk, I report for the first time that this reaction significantly decreases the abundance of the A=7 nuclear systems when the quark mass variation is negative. This is because the resonance at E=0.33 MeV is found to contribute strongly to the reaction rates at the BBN temperature. I also report that the 7Li abundance significantly decreases if the quark mass is larger than the present value, although this is the conclusion assuming that the resonance energies are independent of the quark mass variation. In order to prove this solution, more careful theoretical studies of the binding energies of the excited states are desirable.
- 連絡先
- Name：Akimasa Kataoka
- 備考
- 使用する言語は英語
5月17日（金）
- Campus
- Mitaka
- Seminar
- Solar and Space Plasma Seminar
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- 17 May (Fri), 13:30-15:00
- Place
- Student Seminar Room, Subaru Bldg.
- Speaker
- Takuma Matsumoto
- Affiliation
- NAOJ
- Title
- Thermal responses in a coronal loop maintained by wave heating mechanisms
- Abstract
-
A full 3-dimensional compressible magnetohydrodynamic (MHD) simulation is conducted to investigate the thermal responses of a coronal loop to the dynamic dissipation processes of MHD waves. When the foot points of the loop are randomly and continuously forced, the MHD waves become excited and propagate upward.
Then, 1-MK temperature corona is produced naturally as the wave energy dissipates.
The excited wave packets become nonlinear just above the magnetic canopy, and the wave energy cascades into smaller spatial scales. Moreover, collisions between counter-propagating Alfv´en wave packets increase the heating rate, resulting in impulsive temperature increases. Our model demonstrates that the heating events in the wave-heated loops can be nanoflare-like in the sense that they are spatially localized and temporally intermittent. - Facilitator
- -Name：Masahito Kubo
- Comment
5月17日（金）
- Campus
- Mitaka
- Seminar
- NAOJ seminar
- Regularly Scheduled/Sporadic
- Scheduled
- Date and time
- Fri 17 May 16:00～17:00
- Place
- Large Seminar Room
- Speaker
- Renyue Cen
- Affiliation
- Princeton University
- Title
- “Computing the Universe: from Intergalactic Medium to Interstellar Medium”
- Abstract
-
This talk will highlight some progress made based on our computational efforts. to understand the dynamics of gas in the universe, from intergalactic through circumgalactic to interstellar medium.
Select observables presented include the Lyman alpha forest, Lyman alpha emitters, Lyman alpha blobs, warm-hot intergalactic medium, escape of Lyman continuum photons from galaxies, spanning a redshift range from z=0 to the epoch of reionization. - Facilitator
- -Name：Matsuda, Yuichi