ACTIVE GALACTIC (@active_galactic) header
ACTIVE GALACTIC (@active_galactic) profile picture

主な話題:数物系科学(物理・数学・天文等)、社会基盤(防災・公共交通含む)、先史時代、航空宇宙、SF

z = 0.000000 +/- 0.000027
Joined May 2008
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ACTIVE GALACTIC retweeted
Happy Halloween!
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浜名湖エリア(石灰岩エリア)は人骨がでてくるが、富士箱根ではでてこない
面白い地図だ。縄文時代の解説で日本は湿潤で土壌が酸性に傾きやすく、骨も繊維も残りにくいと聞いたことがある。太古の遺物が豊富に残っている地域には、中性から塩基性の土壌が広がっているところも結構ありそうで、土壌が歴史の見え方にどこまで影響しているか興味を抱いた
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ACTIVE GALACTIC retweeted
「箱を揺さぶればもっと入るはず」という直感的なアプローチで立方体充填問題の記録が更新されるなんて。今まで誰もやったことがなかったのか疑問に思ったけれど、直感的だからこそ計算が簡単ではなかったのか。
new cube packing record for n=12 at 2.931514578 found with this method. beats Haowei Lin's 2026 record (2.93277+). s=2.931514577965 # i x y z w qx qy qz # cube=c+R(w,qx,qy,qz)[-1/2,1/2]^3, Hamilton 1 1.5243879843 2.4315145780 1.3320162706 0.5838886869 -0.5838886869 -0.3988408220 -0.3988408220 2 2.4315145780 2.4315145780 0.5000000000 0.7071067812 0.7071067812 0 0 3 0.5000000000 1.4369539605 1.4377198700 0.5395289954 0.4570650535 0.4570650535 -0.5395289954 4 0.5098735814 0.5769311229 2.3545747284 0.4560511351 -0.5403863020 -0.4560472394 0.5403896022 5 0.6086093613 2.2929283270 2.3887741023 0.0258332833 0.7609821302 -0.6482073268 -0.0081302199 6 2.4315145780 1.4315145780 0.5000000000 0 0 0 -1 7 2.4298401750 2.4215249296 2.2620514795 0.0000269579 0.0016621483 -0.9999712786 0.0073944948 8 1.5800388387 1.4806909324 2.4315145780 0 -0.9765112947 -0.2154662186 0 9 1.6870669871 0.7046048868 1.3931621797 0.1630483719 -0.8266039691 -0.3023204668 0.4458065074 10 0.6714192000 0.5125505069 0.5042784926 0.0019279356 0.0017767559 -0.7100527881 -0.7041435680 11 2.4315145780 0.5648562958 2.4315145780 0.5 -0.5 -0.5 0.5 12 0.5 2.3777488832 0.5 0.7071067812 -0.7071067812 0 0
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ACTIVE GALACTIC retweeted
BREAKING NEWS The Norwegian Nobel Committee has decided to award the 2026 #NobelPeacePrize to Navanethem “Navi” Pillay for her efforts to promote peace and international law. #NobelPrize
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ACTIVE GALACTIC retweeted
硤合先生、ノーベル化学賞おめでとうございます! 硤合研の人から「一度実験に使った撹拌子は、その後どんなに丁寧に洗浄しても、次に使った時に不斉誘導が起きてeeがずれる。なので、反応毎に撹拌子を分けている」話を聞いて、あまりに衝撃的だったのを思い出します。
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ACTIVE GALACTIC retweeted
BREAKING NEWS The Royal Swedish Academy of Sciences has decided to award the 2026 #NobelPrize in Chemistry to Henri B. Kagan and Kenso Soai “for the discovery of non-linear effects and autocatalysis in asymmetric organic synthesis.”
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ACTIVE GALACTIC retweeted
BREAKING NEWS The Royal Swedish Academy of Sciences has decided to award the 2026 #NobelPrize in Physics to Francis Halzen “for decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin.”
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ACTIVE GALACTIC retweeted
BREAKING NEWS The 2026 #NobelPrize in Physiology or Medicine has been awarded to Karl Deisseroth, Peter Hegemann and Georg Nagel “for their discoveries concerning light-gated ion channels and optogenetics.”
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ACTIVE GALACTIC retweeted
プログラマー夜神月
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近くは物凄い火力です。 #日本一の芋煮会フェスティバル – at Yamagata-shi, Yamagata
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ACTIVE GALACTIC retweeted
drama summary for those confused: - Aug 15th: Tristan Buckmaster & Levent Alpöge make progress on a few important math problems - they do NOT have a proof for the $1,000,000 Millenium Prize problem. BUT, they do claim to have a proof for a similar (non-Millenium) Navier Stokes problem that could help lead the way there - Levent works at Anthropic, but this research was independent of his work there, with a mix of GPT and Claude models. Tristan is not related to Anthropic. - Early Sep: Rumor spreads to OpenAI that Anthropic has solved a major problem. Tristan emails OpenAI to clarify. without revealing the problem they solved or how they did it. - After hearing of the rumor, OpenAI started researching Navier Stokes with a new internal model. - Sep 6th: OpenAI's Sebastien Bubeck tells Tristan that they solved the $1,000,000 Millenium Prize Navier Stokes problem. The approach is very similar to Tristan & Levent's approach to the non-Millenium problem. - Tristan is suspicious of the timing, as only few others were trying this approach. OpenAI says the model didn't access his user data directly, but leaves unanswered whether Tristan's chat conversations were part of the training. - OpenAI says they would partially credit Tristan for the $1,000,000 discovery (even though Tristan did not solve the $1,000,000 problem) — but only if they remove Levent as an author, as he works for Anthropic. - Sep 8th: Tristan refuses to remove Levent, and rushes to publish their results independently. Currently unclear is whether Anthropic had a separate solution for the $1,000,000 problem, or whether the rumor was about Tristan & Levent's independent research.
Wow Navier-Stokes thing is getting really ugly. But from the sounds of things it looks like both labs have actually solved Navier-Stokes independently and drama aside is massive
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ここに出てくる Alpöge 氏、S^6 の複素構造をAIで発見したと発表した人と同じ。 S^6 のときの本人のコメントを見る限り、証明を自分で十分に理解・検証してから公表したというより、まずAIを走らせてインパクトの強い結果を出し、数学的な検証はその後専門家に委ねる、と見える。 AIで証明を生成するのは自由だが、その検証コストを数学界に外部化したまま「解けた」と発表するのは、研究者としてあまり健全な態度には思えない。そしてそのような状況でありながら、現在はNSに取り組んでいたと。
It appears OpenAI is claiming its AI just solved Navier-Stokes, the 3rd most famous unsolved math problem in the world. It's one of the 7 Millennium Prize Problems, with a $1 million bounty. (The only two more famous ones are the Riemann Hypothesis and P vs NP) DRAMA: The mathematician who spent a year on this (with AI) says OpenAI raced to the finish after his work leaked to them, then pressured him to drop his co-author, who works at Anthropic To be clear, what's actually verified is the mathematician's result on Navier-Stokes next-door neighbor problem. OpenAI's proof of the real thing hasn't been revealed yet, and OpenAI hasn't responded to the accusations Here's Fable 5.1's summary:
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「虹は偏光である」ことの実験動画です。 #halo_jp
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ACTIVE GALACTIC retweeted
お台場行ったらドローンがぷよぷよやってた
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#熊本地震 発生時の #南九州道 #被災動画 を一般の方から提供頂きました。大きな揺れで橋りょうの接続部が破損する状況が確認できます。現在は、応急復旧が完了し通行可能です。 本復旧に向けた貴重なデータとして活用させていただき、一日も早い復旧に向けて取り組んで参ります。 #九州地方整備局
#南九州道 の #日奈久IC ~ #田浦IC の早期復旧に向け、作業を行っています。 現在、日奈久IC付近の橋梁損傷部における早急な復旧に向け、路面の補修を行っています。被災時、復旧時の状況です。 #八代河川国道事務所 #九州地方整備局
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ACTIVE GALACTIC retweeted
多くの中国人がコメント欄にいるけど、中国の学校が普通じゃないのが分かる。学年とかにもよるけど、こんな感じで勉強漬けだったと思う
中国って学歴競争ヤバイとは聞いてたけど学校が週6日で1日15時間とかが普通らしくて人権無さすぎる 刑務所?
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これ山脈で日陰チェックしても絵になるのスゴい – at Nagano-ken, Japan
シンプルにエモすぎるこのアプリ
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ACTIVE GALACTIC retweeted
This image helps explain what happened along the Nepal–Tibet border. According to reports, a magnitude 4.4 earthquake on the Tibetan side triggered a massive ice avalanche, which then led to the flash flooding of the Bhotekoshi River in Nepal. Around 1,000 people are missing, and many have been killed.
Readers added context they thought people might want to know
Image is AI-generated and has China/Nepal labels reversed. USGS later clarified there was no earthquake — the M4.4 signal was produced by the glacial collapse and debris flow itself (now listed as M5.2 landslide). earthquake.usgs.gov/earthquakes/ev… bbc.co.uk/news/articles/…​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​
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ACTIVE GALACTIC retweeted
BREAKING: At least 380 people missing after flash flood hits near Nepal-Tibet border
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