Re: Dark Matter sighting

Kent Paul Dolan wrote:

Richard Saam <rds...@xxxxxxx> wrote:

Kent Paul Dolan wrote:


This will make it a little harder to disprove dark matter,
it's apparently now been spotted living independently
of normal matter.


The observation is discussed more definitively at:

http://arxiv.org/abs/0705.2171

Richard Saam


Thanks for the link, Richard. It's a bit slow going without
the appropriate education, but the pictures are pretty,
and the sense is getting through.


Considering these observations are just happening,
and nobody knows underlying scientific truth,
I do not know what the appropriate education would be.

In this context,
the 'dark matter' observation for Galaxy Cluster Cl0024+17
in http://arxiv.org/abs/0705.2171
is referenced (figures 10 & 11) in part to critical density

(3/(8*pi))*H^2/H = 9.56E-30 g/cm^3

Deviations from this baseline represent very small amounts of mass.

For example:
considering that this deviation from critical density
were in the form of 1 gram objects
with density 1 gram/cm^3
then the distance between these 1 gram objects
would be ~5E7 meters
and the mean free path would be ~2E10 light years
which means that this tenuous matter would gravitationally lens
but would not noticably attenuate or obscure light
from more distant light sources.
Is there an argument against such reasoning?

Richard Saam
.