Re: A non-tachyon, still-follows-Einsten's-rules FTL idea ... PLEASE comment on it!!!

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#8309

From: meron
Date: Mon, 31 Mar 1997 00:00

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In article <33403FAB.7862@eos.ncsu.edu>, James Grady Ward <jgward@eos.ncsu.edu> writes:
>meron@cars3.uchicago.edu wrote:
>> 
>> In article <333F75B4.78BC@ozemail.com.au>, Chris Muffett <cmuffett@ozemail.com.au> writes:
>> >
>> >    Now the photon and the 3 neutrinos have markedly different
>> >properties. Photons have an intrinsic spin of 1, which means they behave
>> >as bosons. Neutrinos have spin of 1/2, meaning they are fermions,
>> >although they interact very weakly with other particles. This is why
>> >they can disobey the speed limit of light.
>> >
>> They don't disobey any limit.  Where did you take this from?
>
>i think he is refering to their always traveling at c( or real close
>to it), ignoring the change of light speed for different mediums
>such as solid objects.

I believe that this is what he refers to, but there are two errors 
involved in this, namely:

1)  The only speed limit in physics is c, the speed of light in 
vacuum.  There is no different limit imposed in a medium.

2)  This is more important.  The term "speed of light in medium" 
which, unfortunately, physicists did a lot to popularize, is 
meaningless.  There ain't such thing, period.  You can refer to the 
speed of EM radiation of specific frequency in a medium, but the value 
thus obtained is not a constant but a function of frequency 
(wavelength, if you prefer).  You'll get different values for 
radiowaves, visible light, X-rays, gammas etc.  And, what is the limit 
of all these values.  It is c, same c mentioned above.

Mati Meron                      | "When you argue with a fool,
meron@cars.uchicago.edu         |  chances are he is doing just the same"

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From: meron@cars3.uchicago.edu
Subject: Re: A non-tachyon, still-follows-Einsten's-rules FTL idea ... PLEASE comment on it!!!
Date: 1997/03/31
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