Re: Co-location of normal matter and dark matter
From: N:dlzc D:aol T:com \(dlzc\) (net_at_nospam.com)
Date: 06/06/04
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Date: Sat, 5 Jun 2004 21:44:30 -0700
Dear Richard Schumacher:
"Richard Schumacher" <schumach@texas.net> wrote in message
news:40C29827.76FAF88@texas.net...
> The non-neutrino component of dark matter, interacting only
> gravitationally with normal matter, should occupy the same locations as
> normal matter on large scales (clusters of galaxies, unless it is
> extremely hot).
But not necessarily with the same distribution. Dark Matter is proposed to
not even interfere with itself... namely friction.
> Down to what distance scale might this correlation
> hold? (Putting it another way, how close are dark and normal matter to
> thermal equilbrium with each other?)
For your parenthetic question, they of need have no correlation with each
other thermally. The two types of matter cannot transmit heat via
radiation (requiring photons, hence the name Dark), nor via conduction
(also requiring photons).
> For example, if one could shove
> the Sun aside would it leave behind a dark matter counterpart, perhaps
> of roughly similar mass? How about an asteroid?
Better still, if Shoemaker-Levy were shadowed by Dark Matter, the Dark
Matter would have proceeded on through Jupiter... since atmospheric and
lithospheric friction would not apply.
The distribution of Dark Matter appears to not have it be *here*. It
appears to be near the rims of spiral galaxies, and some scattered
distribution across intercluster space (I think).
> If dark matter had much lower density than normal matter, the
> counterpart dark body might extend far beyond that of the normal matter
> body, in which case it could be detected by an abrupt change in the
> motion of a test mass (a departing spacecraft, say).
No such anomalous motion has been seen with Cassini, and was seen at
different "r" with three (four?) earlier probes.
If Dark Matter actually shadowed each bit of matter, then it could not fit
the requirements for Dark Matter. Additionally, if it did shadow normal
matter perfectly, then we would simply have attributed too much
contribution to normal matter, requiring a further Dark^2 Matter (TM). ;>)
David A. Smith
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