Re: Explanation of Ring Shape Dark Matter
- From: charleskmhui@xxxxxxxxx
- Date: Fri, 2 May 2008 02:39:55 +0000 (UTC)
On Apr 28, 12:22 pm, Richard Saam <rds...@xxxxxxx> wrote:
charleskm...@xxxxxxxxx wrote:
http://www.space.com/php/video/player.php?video_id=150407Dark_matter
The above video is a narration about the finding of dark matter formed
in ring shape. Any folks know any possible explanation of the ring
shape.
Volume 126B, number 1,2 PHYSICS LETTERS 23 June 1983
CAN GALACTIC HALOS BE MADE OF BARYONS ?
Dennis J. HEGYI, Keith A. OLIVE
This reference provides logic why dark matter halos
cannot be composed of baryonic matter.
The reasoning is in terms of gravitational collapse time frame (t)
of such baryonic particles being less than the age of a galaxy.
t = (3 pi/(32 G rho))^(1/2) ~ 1E8 years
where baryonic density ~1E-24 g/cc.
But there may be other mechanisms involved in slowing baryonic collapse
such as decelerations as observed in the Pioneer 10 & 11 space craft
for baryonic objects of comparable size.
I've longed been out of resources and time. Would you give me a bit
more of input if it comes to you handy?
So the hypothesis would be that
'small' baryonic objects 'dark matter' would
be subject to deceleration in a background 'dark energy' 'fluid' media
which would generate such ring shaped 'dark matter'.
This is the first time I hear about this kind of hypothesis. Why
background dark energy fluid media can be hypotheszed to exist in the
first place?
How the dark energy fluid media appears to decelerate why not
accelerate as in usual negative pressure interpretation of the
negative cosmological constant.
If this hypothesis is valid, I am wondering under what condtion(s) can
one turn the face-meaning of the hypothesis in a dual way:
Under some duality condition, "small fermionic dark matter would be
subject to acceleration in a background dark energy fluid media at
other limit."
Thanks for the posting.
Charles Hui
.
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