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CMBR and neutron stars



 
 
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Old August 2nd 05 posted to sci.astro,sci.physics.relativity
mazafaka
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Posts: 46
Default CMBR and neutron stars


N:dlzc D:aol T:com (dlzc) wrote:
Dear Bilge:

"Bilge" wrote in message
...
N:dlzc D:aol T:com \(dlzc\):
The CMBR appears to have a perfect blackbody emission curve,
at
least from what is left after passing through intergalactic
and
interstellar "stuff". Normal matter does not produce the kind
of
emission curve that the CMBR produces (apparently).


Well, it does when the spectrum is produced by free electrons
(or charges, in general) rather than by excitations of bound
charges, which produce a discrete spectrum.


Compton scattering from free charges with a range of velocities
in accordance wiht temperature. That sounds right, epecially in
light of "neutron stars aren't all neutrons".

Certain types of neutron stars also appear to have perfect
blackbody emission curves. I'm not sure how
in-general-neutral
particles can emit thermal photons, but that is another
lesson.


Recall that while neutrons are neutral, overall, they have
magnetic dipole moments and are bound states of charged quarks.
However, there is also more to a neutron star than just
neutrons.


Atmospheres made of iron! Go figure.

Black holes are expected to "start with" very dense cores,
such
as neutron stars.

What is the possibility that the CMBR is not "hydrogen gas at
about 3000 K" but rather the emissions of the "matter
structure"
that triggered this Universe?


Anything is possible if one can concoct a theory around it
which
doesn't contradict observations.


wrong

anybody can do easy theories which
dosnt contradict observations

the trick is in making good theorirs contradicting
erratical observations

Unfortunately, that's very
hard to
do. There should be evidence from neutrinos that could say more
about the universe prior to the period which produced the
cosmic
background radiation, but unfortunately, neutrinos are not as
user freindly. Obtaining the equivalent neutrino spectum is not
yet technologically feasible. Our understanding of the universe
prior to the production of the background radiation comes
mainly
from tying the electroweak and strong interactions to the
temperatures at which those forces should have appeared as
distinct.


"Concoct" indeed! But if the shoe fits... I guess I should at
least wear them!

Thanks. Thanks to all, actually.

David A. Smith


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