Re: Lepton predictions and cosmological limits on neutrino mass

From: Uncle Al (UncleAl0_at_hate.spam.net)
Date: 02/23/05 

Date: Wed, 23 Feb 2005 09:56:33 +0000 (UTC)

Phillip Helbig---remove CLOTHES to reply wrote:
>
> In article <cv6nrj$m1u$1@hercules.btinternet.com>, "Franz Heymann"
> <notfranz.heymann@btopenworld.com> writes:
>
> > My understanding is that the neutrinos arrived here before the
> > photons, and that the astrophysical interpretation relies on a
> > knowledge of how deep in the star the neutrinos and the original
> > photons are produced, and on how long it takes before the first
> > photons are emitted from the surface of the star. Is the propagation
> > , consisting of a vast number of absorptions and re-emissions in
> > random directions, of light through the interior of a star understood
> > to the required accuracy?
>
> The neutrino mass is calculated from the dispersion in the times of
> arrival of the neutrinos. If they had 0 mass, they would all arrive at
> the same time, since they must travel at the same speed. If they have
> non-zero mass, then there can be a distribution in times of arrival.

Weakly interacting neutrinos exit the supernova perhaps 30 minutes
before the strongly scattered photons make it out. There is no
observational evidence that neutrino mass compared with neutrino
energy leads to any arrival time incompatible with neutrinos traveling
within an immeasurably small epsilon of lightspeed. 

-- 
Uncle Al
http://www.mazepath.com/uncleal/
 (Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf

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