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发帖数: 5763 | 1 http://news.sciencemag.org/scienceinsider/2012/02/breaking-news
t 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. |
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