🚀 go-pugleaf

 snodgras@cyber.net (John E. Snodgrass) wrote:
> The commonly expressed view is otherwise, i.e. that
>black holes contain singularities, which cannot be categorized
>as 'matter'.

  No, the commonly expressed view is that the singularity is an
artifact of trying to use the theory in a regime where its
applicability breaks down. 

>       My suggestion is to think of everything as involving
>physical systems, and never to geometrize or probabilize. Try it,
>and you'll find you can see plenty of alternatives.

oh.
and what would they be?

>       Neutrinos may correspond to some segment of the spectrum
>in their velocity. How close their reception was in terms of the
>event (which itself is a somwhat drawn out affair) or whether
>they actually came from this supernovae (since the affected
>experiments did not involve directional receivers or other ways of
>telling the source of the neutrinos) seem relevent questions.

Questions to which there are easy answers, if you look it up.
Supernovae are indeed drawn-out affairs, but the neutrino emission
is not.  It occurs on a timescale of 3-10 sec.  In fact, the
neutrinos emitted by SN 1987A were detected over a 12-sec period
at Kamiokande II (11 events) and a 6-sec period at IMB (8 events).
These detectors are water Cerenkov-light tanks and *are* directionally
sensitive, but do not discriminate direction well for neutrinos.
However, such a large excess of neutrinos were observed that an
astounding coincidence is required for them to have come from any
other source.  The neutrinos were observed 18 hours before the
supernova was spotted visually.  (Reference: W.C.W. Williams, Nuclear
and Particle Physics pp. 364-366)

You might try this little problem: 
  "Suppose that the neutrinos emitted by the supernova SN1987A were
all generated and left the core in a period of one second.  A large 
fraction of the twenty neutrinos detected 160,000 years later were
all observed in a period of 2 sec, with a mean energy of about 8
MeV.  Make a rough estimate of an upper limit on the neutrino mass."
(this is Williams's problem 12.18)