Re: Is the Sun mostly dark matter ?

GatherNoMoss wrote:
On Mar 13, 1:36 pm, Uncle Al <Uncle...@xxxxxxxxxxxxx> wrote:


Observed gravitation vs. core reaction rate re neutrino emission.



Yes.

But WHY ?

Why isn't dark matter and normal matter all mixed.

Why ever would there be seperation ?

Matter in a gravitational field has gravitational potential energy (PE) and kinetic energy (KE). As the matter moves in response to the gravitational field, energy is converted between the two. As matter falls towards the centre its gravitational PE decreases and its KE increases. Having passed the centre of mass, it KE is converted back to gravitational PE.

For ordinary matter, the effect of the electromagnetric force means that atoms can affect each other when they collide - electrons apply the EM force on each other, giving each other energy which can then be radiated away.

Dark Matter on the other hand (like neutrinos) does not appear to be affected by the EM force, so there is not the same method for energy to be lost.

Consider a large (galaxy sized) cloud of mixed ordinary and dark matter. both types of matter will be attraced by gravity to accelerate towarde the centre, but although the ordinary matter will collide, lose energy and collect at the centre; the dark matter will be unable to lose energy and will thus remain distributed more evenly through the full extent of the original volume.

Hence the separation.

There is dark matter in the Sun, but the density of dark matter within the sun is not so much greater than the density across the solar system as a whole. This is in contrast to ordinary matter, where the sun represents the overwhelming majority of the mass of the solar system.
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