Re: Could Dark Matter be here on earth?

Marvin the Martian wrote:
On Wed, 27 May 2009 09:15:59 -0700, YKhan wrote:

On May 26, 12:04 pm, Marvin the Martian <mar...@xxxxxxxxxxxx> wrote:
If the particle is free, that is correct. However, matter falling down
a gravitational well will exert tidal forces on an object like the
earth, which would dissipate some of that energy as heat.

First, Dark Matter is all free particles.

Particles of what? It's not neutrinos, we know how many neutrinos are
passing through the earth. There is no other known massive particle that
it could be.

Particles of dark matter, whatever that happens to be. And that's the
point of calling it Dark Matter -- it's not matter from the known tool box.


Second, tidal forces that are
resisted is entirely due to an interaction between gravity and
electromagnetic forces. The heat given off is photons from the
electromagnetic force.

And when this dark matter interacts with real matter, both of them
undergo a force. The real matter would radiates some of the energy of the
interaction away, and the dark matter would lose energy.

Or it gains energy (slingshot, or gravity assist trajectory).


I keep repeating this, and you keep ignoring it. How many more times
would you like to clip out where I point out that there is a loss of
energy and keep repeating this presumption that all dark matter
interactions are with dark matter?

And we're pretending there are no gravity waves. What's up with that?

You have yet to characterize the magnitude of the possible energy
loss (or gain) due to gravitational interaction of DM and Normal Matter.
You continue to ignore the fact that gravitational waves from even
*enormous* mass systems are puny and at the ragged limit of
detectability. A DM particle passing through a neutron star would
hardly even notice it.


Further, if this thing had 1/2 spin, they would have found some of them
in neutrino detectors. They didn't. So, we're talking 0 spin here; some
*** little boson particle in a universe of fundamental fermion
particles. What's more, since these particles have been expanding since
the big bang, without interactions, they should be cold; that is, they
would separate out by relative velocity. So, now you have a bunch of
cold bosons that DON'T form BECs.

The dark matter idea is weak, bordering on non-science. I'm not sure why
some people here think that it is now physics gospel, when it isn't, and
that it must not be questioned and that anyone who questions it is fair
game for their anti-social behavior.

I think you want to think that people treat DM as gospel just so you'll
have something to rail against. The science community doesn't just
swallow things whole without damn good evidence. In case you
haven't noticed, the jury is still out on what DM might be comprised of
and what all its properties might be. It could be an example of a
whole new set of particles that don't fit the standard theory models
at all. Wouldn't that be interesting!


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