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Relativity, causality and headaches

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titux
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re: Relativity, causality and headaches
titux   9/29/2011 9:07:58 AM
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It seems that the experiment has been confirmed by CERN few days later. Anyway, the Italian Minister for Scientific Research commented "The construction of the tunnel between CERN and Gran Sasso Laboratories, through which the experiment took place, Italy has contributed a sum now estimated at around 45 million euros" which makes 730 kms underground... I guess Italian scientists need to run faster than light and have other superpowers too, to get going doing their jobs.

David Ashton
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re: Relativity, causality and headaches
David Ashton   9/24/2011 11:48:02 PM
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Finally got it. Nice article - there were some bits which were not totally over my head. It's a good illustration of how good GPS technology is. Especially impressive were the graphs showing how the distance between CERN and Opera was gradually increasing due to continental drift of around 1cm / year, and a step of around 7cm due to an earthquake. Very impressive stuff.

David Ashton
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re: Relativity, causality and headaches
David Ashton   9/24/2011 10:28:23 AM
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Thanks for that. I'm having great difficulty downloading the article, it keeps hanging, tried different browsers with no joy. But I have got enough to see that this is a pretty impressive measurement.

vrheaume
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re: Relativity, causality and headaches
vrheaume   9/23/2011 1:10:40 PM
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David, try this article: http://static.arxiv.org/pdf/1109.4897.pdf As you remarked, there is a common reference (GPSes and cesium clocks (?)) at the emitter and detector. As I understand it, neutrinos are emitted periodically (for 10us every 50ms), and then electronics compares timestamps...

David Ashton
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re: Relativity, causality and headaches
David Ashton   9/23/2011 10:58:14 AM
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This begs the question Brian.... HOW do they know they are 60ns faster than they should be? It kind of implies that they have a reference which advises them instantaneously that neutrinos are on their way, so they can click their stopwatches. But I'm sure it's not as simple as that. Can anyone explain it in terms that someone with about a tenth the intellect of Einstein (and I probably flatter myself there...)can understand? I did check the article but that was not much help either.

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