作者psion (psion)
看板Physics
標題[新聞] 超越光速？光纜鬆脫？
時間Thu Feb 23 18:32:39 2012
http://news.sciencemag.org/scienceinsider/2012/02/breaking-news-error-undoes-faster.html
縮址
http://tinyurl.com/72ntpbr
BREAKING NEWS: Error Undoes Faster-Than-Light Neutrino Results
by Edwin Cartlidge on 22 February 2012, 1:45 PM | 0 Comments
It appears that the faster-than-light neutrino results, announced last
September by the OPERA collaboration in Italy, was due to a mistake after
all. A bad connection between a GPS unit and a computer may be to blame.
Physicists had detected neutrinos travelling from the CERN laboratory in
Geneva to the Gran Sasso laboratory near L'Aquila that appeared to make the
trip in about 60 nanoseconds less than light speed. Many other physicists
suspected that the result was due to some kind of error, given that it seems
at odds with Einstein's special theory of relativity, which says nothing can
travel faster than the speed of light. That theory has been vindicated by
many experiments over the decades.
According to sources familiar with the experiment, the 60 nanoseconds
discrepancy appears to come from a bad connection between a fiber optic cable
that connects to the GPS receiver used to correct the timing of the
neutrinos' flight and an electronic card in a computer. After tightening the
connection and then measuring the time it takes data to travel the length of
the fiber, researchers found that the data arrive 60 nanoseconds earlier
than assumed. Since this time is subtracted from the overall time
of flight, it appears to explain the early arrival of the neutrinos.
New data, however, will be needed to confirm this hypothesis.
讓我想起十幾年前CERN被火車惡搞的事，不過那次「激發」了幾百篇討論left-right
symmetry的文章，這次好像大家蠻冷靜的。XD
p.s.:另外一個相關網址：
http://www.physorg.com/news/2012-02-faster-neutrinos-faulty-wiring.html
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◆ From: 219.84.9.117
※ 編輯: psion 來自: 219.84.9.117 (02/23 18:36)
1F：→ MOONRAKER:由此可見光纜鬆脫時就可以超光速。（寶賊談） 02/23 18:36
2F：推 guesttry:救我粗淺的認識...愛因斯坦從不進行實驗... 02/23 22:42
3F：→ guesttry:純粹憑紙筆演算... 02/23 22:43
4F：→ guesttry:所以沒有精密度的問題...如同數學的定理是打不破的 02/23 22:44
5F：→ guesttry:我不清楚去鑽研粒子的人有沒有探究愛因斯坦的公式 02/23 22:45
6F：→ guesttry:怎樣來的..硬要用實驗去打破本質為真的定理??? 02/23 22:46
7F：推 ic6413:.....搞不清楚狀況 02/23 23:14
8F：→ ERT312:物理又不是哲學，不實驗難道靠唬爛 02/23 23:19
9F：→ caseypie:最近非要張大嘴暴露自己程度的推文變多了 02/23 23:36
10F：→ MOONRAKER:寶賊：…愛因斯坦時沒有光纜故沒有鬆脫的問題… 02/24 01:03
11F：推 HDT:因為愛因斯坦需要人幫他實驗啊= = 02/24 11:17
12F：→ HDT:按照二樓所言 那愛因斯坦何必對1919年愛丁頓的日蝕觀測那麼在 02/24 11:19
13F：→ HDT:意? 又何必一再拿掉又放上宇宙學常數 02/24 11:22
14F：→ tsongs:光速不變不是愛因斯坦算出來的，是觀察出來的 02/24 11:24
15F：→ tsongs:先有實驗觀察現像數據，然後才有模型理論演算 02/24 11:26
16F：→ tsongs:更好的儀器精密度也常修正以前的理論 02/24 11:28
17F：→ tsongs:因為觀察到光速不變，才生出特殊相對論 02/24 11:31
18F：→ noonee:也不盡然 如果你希望能夠保留物理的因果性 02/24 15:22
19F：→ noonee:就需要不同觀察者看到的物理都一樣 保留同樣的因果順序 02/24 15:23
20F：→ noonee:為了達到如此 就必須存在不同觀察者都看到一樣速度的 02/24 15:23
21F：→ noonee:終極速度 愛因斯坦假設這就是光速 02/24 15:23
22F：→ noonee:所以我個人真正好奇的是 為什麼這個宇宙會有因果性？ 02/24 15:24
23F：推 buttercrab:理論正需要實驗來佐證的呀 不能本末倒置吧 02/24 16:35
24F：→ ic6413:......... 02/24 22:10
25F：→ chomolungma:二樓語出驚人.... 02/24 23:13
26F：→ waddler:以後大家上數學課就好了 物理課全部改打籃球 培養下個書豪 02/24 23:39
27F：→ waddler:反正實驗不重要 XP 02/24 23:39
28F：推 k1220790108:物理是實證科學又不是哲學 不做實驗驗證難道要大家想 02/25 15:07
29F：→ k1220790108:像這世界長怎樣就是怎樣嗎 02/25 15:07
30F：推 ocean5566:佛經：科科 02/25 23:36
31F：推 playskin:二樓有道理，不做實驗不一定要解讀成就是貶低愛因斯坦 03/09 20:52
32F：→ playskin:物理的"真實性"不光是從實驗得來，愛因斯坦最擅長的 03/09 20:53
33F：→ playskin:"想像實驗"在邏輯與數學上相當週延的支持了宇宙擁有對稱 03/09 20:54
34F：→ playskin:性，這對理論物理和科哲可是更深入的成就。 03/09 20:55