Re: Explanation of Ring Shape Dark Matter

charleskmhui@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.

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).

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

.

Relevant Pages