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Earth might have hairy dark matter



 
 
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  #1  
Old November 25th 15, 06:50 PM posted to sci.astro,sci.physics
Yousuf Khan[_2_]
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Posts: 1,686
Default Earth might have hairy dark matter

But what happens when one of these streams approaches a planet such
as Earth? Prézeau used computer simulations to find out.

His analysis found that when a dark matter stream goes through a
planet, the stream particles focus into an ultra-dense filament, or
“hair,” of dark matter. In fact, there should be many such hairs
sprouting from Earth.

A stream of ordinary matter would not go through Earth and out the
other side. But from the point of view of dark matter, Earth is no
obstacle. According to Prézeau’s simulations, Earth’s gravity would
focus and bend the stream of dark matter particles into a narrow
dense hair.

Hairs emerging from planets have both “roots,” the densest
concentration of dark matter particles in the hair, and “tips,”
where the hair ends. When particles of a dark matter stream pass
through Earth’s core, they focus at the “root” of a hair, where the
density of the particles is about a billion times more than average.
The root of such a hair should be around 600,000 miles (1 million
kilometers) away from the surface, or twice as far as the Moon. The
stream particles that graze Earth’s surface will form the tip of the
hair, about twice as far from Earth as the hair’s root.

Another fascinating finding from these computer simulations is that
the changes in density found inside our planet — from the inner core,
to the outer core, to the mantle to the crust — would be reflected in
the hairs. The hairs would have “kinks” in them that correspond to
the transitions between the different layers of Earth. Theoretically,
if it were possible to obtain this information, scientists could use
hairs of cold dark matter to map out the layers of any planetary
body, and even infer the depths of oceans on icy moons.


Earth might have hairy dark matter | Astronomy.com
http://www.astronomy.com/news/2015/1...ry-dark-matter
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  #2  
Old November 26th 15, 06:39 PM posted to sci.astro,sci.physics
Lester Thorpe
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Posts: 3
Default Earth might have hairy dark matter

On Wed, 25 Nov 2015 12:50:03 -0500, Yousuf Khan wrote:


Earth might have hairy dark matter | Astronomy.com
http://www.astronomy.com/news/2015/1...ry-dark-matter


This is not likely because ANY significant presence of dark matter
within or near the solar system would disturb the orbital stability.

In other words, if significant amounts of dark matter were present
among the earth and other planets, the stable orbits of the solar system
would have been disrupted long ago.

The stability of the solar system implies an upper limit on the
local density of dark matter and such an upper limit is quite
small.

Thus the problem with dark matter is not just to explain its
nature and composition but also to explain why it is so non-uniformly
distributed within galaxies.

  #3  
Old November 26th 15, 07:41 PM posted to sci.astro
dlzc
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Posts: 1,426
Default Earth might have hairy dark matter

Dear Lester Thorpe:

On Thursday, November 26, 2015 at 10:39:31 AM UTC-7, Lester Thorpe wrote:
On Wed, 25 Nov 2015 12:50:03 -0500, Yousuf Khan wrote:


Earth might have hairy dark matter | Astronomy.com
http://www.astronomy.com/news/2015/1...ry-dark-matter


This is not likely because ANY significant presence
of dark matter within or near the solar system would
disturb the orbital stability.


Not if it were uniformly distributed. Of course this paper says the distribution might be displaced by collections of matter... which makes the problem you allude to.

....
Thus the problem with dark matter is not just to
explain its nature and composition but also to explain
why it is so non-uniformly distributed within galaxies.


Easy. It is primarily a "calibration error".

But if we don't look for exotic matter too, it is not Science.

David A. Smith
  #4  
Old November 27th 15, 03:39 AM posted to sci.astro,sci.physics
Yousuf Khan[_2_]
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Posts: 1,686
Default Earth might have hairy dark matter

On 26/11/2015 12:39 PM, Lester Thorpe wrote:
On Wed, 25 Nov 2015 12:50:03 -0500, Yousuf Khan wrote:


Earth might have hairy dark matter | Astronomy.com
http://www.astronomy.com/news/2015/1...ry-dark-matter


This is not likely because ANY significant presence of dark matter
within or near the solar system would disturb the orbital stability.

In other words, if significant amounts of dark matter were present
among the earth and other planets, the stable orbits of the solar system
would have been disrupted long ago.

The stability of the solar system implies an upper limit on the
local density of dark matter and such an upper limit is quite
small.

Thus the problem with dark matter is not just to explain its
nature and composition but also to explain why it is so non-uniformly
distributed within galaxies.


I have my doubts about this theory too, but in reality the amount of
dark matter within the solar system must be minuscule, and very low
density, not enough to disturb the orbits of the planets.


Yousuf Khan
 




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