RE: Neutrinos still travel faster than light
November 19, 2011 at 2:11 pm
(This post was last modified: November 19, 2011 at 2:53 pm by little_monkey.)
(November 19, 2011 at 12:19 pm)IATIA Wrote:Stephanie Pappas, LiveScience Senior Writer Wrote:If the neutrinos are actually going faster than light, though, it might be possible to use them to communicate with the past, Lloyd (Seth Lloyd, a physicist at the Massachusetts Institute of Technology) said. You could send off a faster-than-light message to someone moving at a rapid velocity with respect to you. They could then bounce the faster-than-light message back, and it would arrive before the signal you sent to them.
Yes, that's correct, but it's not that you could travel to the past and change it as in the Grandfather_paradox.
As pointed out in another thread ( see: http://atheistforums.org/thread-8674-page-6.html), that van Elburg had pinpointed the error, here's another paper that reaffirms the van Elburg's finding:
Quote:Conclusion
Our calculation above is a corrected version of van Elburg’s idea and explains why there is an approximately 60 ns difference in the arrival time of neutrinos and what is expected based on the speed of light.The problem lies in the method used to synchronize and set the clocks – there is nothing specifically wrong with using GPS atomic clocks, even for synchronization, except that the clocks should not be set to follow the GPS clock after the point of synchronization. This is unfortunately what happens with the PolaRx2e receivers used as the time-bases in the set-up. If, instead, the Cs4000 clock were the only clocks used, this result would not appear.
http://arxiv.org/ftp/arxiv/papers/1111/1111.1922.pdf