作者psion (psion)
看板Physics
标题[新闻] 超越光速？光缆松脱？
时间Thu Feb 23 18:32:39 2012
http://news.sciencemag.org/scienceinsider/2012/02/breaking-news-error-undoes-faster.html
缩址
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.
让我想起十几年前CERN被火车恶搞的事，不过那次「激发」了几百篇讨论left-right
symmetry的文章，这次好像大家蛮冷静的。XD
p.s.:另外一个相关网址：
http://www.physorg.com/news/2012-02-faster-neutrinos-faulty-wiring.html
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◆ From: 219.84.9.117
※ 编辑: psion 来自: 219.84.9.117 (02/23 18:36)
1F：→ MOONRAKER:由此可见光缆松脱时就可以超光速。（宝贼谈） 02/23 18:36
2F：推 guesttry:救我粗浅的认识...爱因斯坦从不进行实验... 02/23 22:42
3F：→ guesttry:纯粹凭纸笔演算... 02/23 22:43
4F：→ guesttry:所以没有精密度的问题...如同数学的定理是打不破的 02/23 22:44
5F：→ guesttry:我不清楚去钻研粒子的人有没有探究爱因斯坦的公式 02/23 22:45
6F：→ guesttry:怎样来的..硬要用实验去打破本质为真的定理??? 02/23 22:46
7F：推 ic6413:.....搞不清楚状况 02/23 23:14
8F：→ ERT312:物理又不是哲学，不实验难道靠唬烂 02/23 23:19
9F：→ caseypie:最近非要张大嘴暴露自己程度的推文变多了 02/23 23:36
10F：→ MOONRAKER:宝贼：…爱因斯坦时没有光缆故没有松脱的问题… 02/24 01:03
11F：推 HDT:因为爱因斯坦需要人帮他实验啊= = 02/24 11:17
12F：→ HDT:按照二楼所言 那爱因斯坦何必对1919年爱丁顿的日蚀观测那麽在 02/24 11:19
13F：→ HDT:意? 又何必一再拿掉又放上宇宙学常数 02/24 11:22
14F：→ tsongs:光速不变不是爱因斯坦算出来的，是观察出来的 02/24 11:24
15F：→ tsongs:先有实验观察现像数据，然後才有模型理论演算 02/24 11:26
16F：→ tsongs:更好的仪器精密度也常修正以前的理论 02/24 11:28
17F：→ tsongs:因为观察到光速不变，才生出特殊相对论 02/24 11:31
18F：→ noonee:也不尽然 如果你希望能够保留物理的因果性 02/24 15:22
19F：→ noonee:就需要不同观察者看到的物理都一样 保留同样的因果顺序 02/24 15:23
20F：→ noonee:为了达到如此 就必须存在不同观察者都看到一样速度的 02/24 15:23
21F：→ noonee:终极速度 爱因斯坦假设这就是光速 02/24 15:23
22F：→ noonee:所以我个人真正好奇的是 为什麽这个宇宙会有因果性？ 02/24 15:24
23F：推 buttercrab:理论正需要实验来佐证的呀 不能本末倒置吧 02/24 16:35
24F：→ ic6413:......... 02/24 22:10
25F：→ chomolungma:二楼语出惊人.... 02/24 23:13
26F：→ waddler:以後大家上数学课就好了 物理课全部改打篮球 培养下个书豪 02/24 23:39
27F：→ waddler:反正实验不重要 XP 02/24 23:39
28F：推 k1220790108:物理是实证科学又不是哲学 不做实验验证难道要大家想 02/25 15:07
29F：→ k1220790108:像这世界长怎样就是怎样吗 02/25 15:07
30F：推 ocean5566:佛经：科科 02/25 23:36
31F：推 playskin:二楼有道理，不做实验不一定要解读成就是贬低爱因斯坦 03/09 20:52
32F：→ playskin:物理的"真实性"不光是从实验得来，爱因斯坦最擅长的 03/09 20:53
33F：→ playskin:"想像实验"在逻辑与数学上相当周延的支持了宇宙拥有对称 03/09 20:54
34F：→ playskin:性，这对理论物理和科哲可是更深入的成就。 03/09 20:55