[eufisica] The Neutrino's Saga - Part 5

[EUFISICA]

It seems interesting how the scientific community try to explain the results of the OPERA experiment. See here, here, and here.
Here are the last results:

• Special relativity and clock synchronization; 

"But were the clocks perfectly synchronized?
Keeping time is again the domain of the GPS satellites which each broadcasting a highly accurate time signal from orbit some 20,000km overhead. But is it possible the team overlooked the amount of time it took for the satellite signals to return to Earth? In his statement, van Elburg says there is one effect that the OPERA team seems to have overlooked: the relativistic motion of the GPS clocks.
Sure, radio waves travel at the speed of light, so what difference does the satellite position make? The truth is, it doesn’t.. but the time of flight does. Here we have a scenario where one clock is on the ground while the other is orbiting. If they are moving relative to one another, this calculation needs to be included in the findings. The orbiting probes are positioned from West to East in a plane inclined at 55 degrees to the equator… almost directly in line with the neutrino flight path. This means the clock on the GPS is seeing the neutrino source and detector as changing."

• Times Of Flight Between A Source And A Detector Observed From A GPS Satellite;

"But there is an additional subtlety. Although the speed of light is does not depend on the the frame of reference, the time of flight does. In this case, there are two frames of reference: the experiment on the ground and the clocks in orbit. If these are moving relative to each other, then this needs to be factored in."

paper: http://arxiv.org/abs/1110.2685

• Cautionary Tale From Neutrinoland (thinking about all the explanations and Physics behind in two published articles)

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Posted By EUFISICA to eufisica at 10/18/2011 01:18:00 PM