Re: Explanation of Ring Shape Dark Matter

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charleskmhui@yahoo.com - 27 Apr 2008 23:30 GMT

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.

I always do not believe that the ring shape is the head on view of two
cluster collision as suggested by the narrator Dr. J. This is because
this type of explanation has presupposed the dyanamics of dark matter
follows the same dynamics of ordinary matter. Why?

Second, since they are "dark" why not one supposes the spacetime
fabric around the dark matter may not be the same as the one around
ordinary matter. If so, why follow the same inertia law? Or same
dynamical law in collision?

I've posted several posting about ring shaped galaxies in past. I am
very interested in ring, elliptical, spherical, or ellipsoidal shape
galaxies formation especially young galaxies forming at the outer ring
of the ring, sphere.... (outer boundary of the shape).

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Richard Saam - 28 Apr 2008 18:22 GMT

> http://www.space.com/php/video/player.php?video_id=150407Dark_matter
>
[quoted text clipped - 16 lines]
> galaxies formation especially young galaxies forming at the outer ring
> of the ring, sphere.... (outer boundary of the 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.

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'.

Such 'small' baryonic objects could not be detected electromagnetically.

Richard D. Saam

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charleskmhui@yahoo.com - 02 May 2008 03:39 GMT

> charleskm...@yahoo.com wrote:
> >http://www.space.com/php/video/player.php?video_id=150407Dark_matter
[quoted text clipped - 20 lines]
> 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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Natural Science Forum / Physics / Research / May 2008

Re: Explanation of Ring Shape Dark Matter