updated posts

Author: ikeda46

content/posts/2016.EHT/featured.png

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+---
+date: 2016-04-01
+publishDate: 2016-04-01
+tags: ["プロジェクト", "天文学"]
+title: Event Horizon Telescope
+featured: featured.png
+math: true
+---
+### プロジェクト: <a href="https://www.miz.nao.ac.jp/eht-j/top.html" target="_blank" rel="noopener">Event Horizon Telescope</a>
+
+### EHTの目的
+
+EHT (Event Horizon Telescope) は、地球規模の電波干渉計を用いてブラック
+ホールシャドウの撮像を目指す国際共同研究プロジェクトです。
+
+ブラックホールシャドウの撮像は、人類史上まだ実現されていない未開のフロ
+ンティアで、その実現はブラックホールという光さえ吸い込む暗黒の天体の存
+在を直接的に示す強力な証拠となります。さらに、ブラックホール周辺の強重
+力場での一般相対論や、ブラックホール近傍でのガス降着・噴出のプロセス等
+を研究する上でも、ブラックホールシャドウや周辺領域の撮像が重要な鍵とな
+ります。EHT ではミリ波・サブミリ波帯の超長基線電波干渉計 (VLBI) を地球
+規模で構築し、ブラックホール近傍の様子を描き出すことで、これらの研究を
+推進します。また、EHT以外のVLBIを活用したセンチ波帯の観測プロジェクト
+と共同観測を実施したり、シミュレーションを駆使した理論研究を組み合わせ
+たりすることで、ブラックホール周辺の現象・構造のさらなる理解を目指しま
+す。これからもEHTは望遠鏡の拡張や広帯域化により観測システムを発展させ、
+より高い解像度と感度を実現し、ブラックホール研究を進めていきます。

content/posts/2016.EHT/index.ja.md

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+---
+date: 2016-04-01
+publishDate: 2016-04-01
+tags: ["Project", "Astronomy"]
+title: Event Horizon Telescope
+featured: featured.png
+math: true
+---
+### Project: <a href="https://eventhorizontelescope.org/" target="_blank" rel="noopener">Event Horizon Telescope</a>
+
+### About EHT
+
+A long standing goal in astrophysics is to directly observe the
+immediate environment of a black hole with angular resolution
+comparable to the event horizon.  Such observations could lead to
+images of strong gravity effects that are expected near a black hole,
+and to the direct detection of dynamics near the black hole as matter
+orbits at near light speeds.  This capability would open a new window
+on the study of general relativity in the strong field regime,
+accretion and outflow processes at the edge of a black hole, the
+existence of event horizons, and fundamental black hole physics.
+
+The EHT is an international collaboration that has formed to continue
+the steady long-term progress on improving the capability of Very Long
+Baseline Interferometry (VLBI) at short wavelengths in pursuit of this
+goal.  This technique of linking radio dishes across the globe to
+create an Earth-sized interferometer, has been used to measure the
+size of the emission regions of the two supermassive black holes with
+the largest apparent event horizons: SgrA* at the center of the Milky
+Way and M87 in the center of the Virgo A galaxy.  In both cases, the
+sizes match that of the predicted silhouette caused by the extreme
+lensing of light by the black hole.  Addition of key millimeter and
+submillimeter wavelength facilities at high altitude sites has now
+opened the possibility of imaging such features and sensing the
+dynamic evolution of black hole accretion. The EHT project includes
+theoretical and simulation studies that are framing questions rooted
+at the black hole boundary that may soon be answered through
+observations.
+
+By linking together existing telescopes using novel systems, the EHT
+leverages considerable global investment to create a fundamentally new
+instrument with angular resolving power that is the highest possible
+from the surface of the Earth.  Over the coming years, the
+international EHT team will mount observing campaigns of increasing
+resolving power and sensitivity, aiming to bring black holes into
+focus.
+

content/posts/2016.EHT/index.md

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+---
+date: 2025-03-20
+publishDate: 2025-03-01
+tags: ["Organizing International Meeting"]
+title: Further Developement of Information Geometry 2025
+featured: featured.png
+math: true
+---
+
+### International Meeting: <a href="https://sites.google.com/view/fdig2025/" target="_blank" rel="noopener">FDIG2025</a>
+
+An international syposium Further Developements of Information Geometry 2025 (FDIG2025) was held in the University of Tokyo in March 2025. As one of the committee members, the coference was successful.
+