Em 23/9/2011 10:48, smplx escreveu:
>
> On Fri, 23 Sep 2011, IVP wrote:
>
>>> http://www.bbc.co.uk/news/science-environment-15017484
>> I think the neutrinos just get excited by a trip to Italy
>>
>> The figure I've seen is 20ppm faster than light. They allegedly
>> arrived 60ns before light would have, with an accountable
>> error of 10ns
>>
>> One scientist asked why neutrinos haven't been observed (for
>> whatever reason) ahead of supernovae, which they should do
>> by a significant time period if at least one flavour of neutrino is
>> 20ppm faster than light
>>
>> 20ppm of 1 year is 10.5 minutes. Even 1ppm faster than light
>> would be 30s per lightyear distance
>>
>> Joe
> 60ns measured between 2 points lets you plot one point on a curve. If you=
=20
> don't know what shape the curve is, assuming it's a straight line and=20
> looking for other points on that line isn't going to get you anywhere :-)
>
> Regards
> Sergio Masci


The neutrinos traveled from Swiss to Italy inside rock (and perhaps
magma) in a straight line. For neutrinos that's easy.
In the 60ns the light travels approximately 18m.

My question is: Did they know the exact distance with a precision of a
few meters between two points separated by 732km? Both buried under
hundreds of meters of rock?

I'm sure they could not send anything else through the same path to compare=
..
Another challenge would be the synchronization of the two clocks at such
distance.

Perhaps they are simply using a distance which is not that precise.


Isaac

--=20
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