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Astronomy and Cosmology
Cosmology
Is the influence of dark matter symmetric?
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[QUOTE="phinds, post: 5457259, member: 310841"] Not true at all. What you are missing is the ramifications of the fact that dark matter does not interact with anything except gravitationally. What this means is that a given particle of dark matter will travel from the halo in through the center of the galaxy, drawn there by gravity, but since it doesn't interact with anything, it just keeps going, slowing down slowly until it gets to the other side of the halo. Its speed is greatest at the center of the galaxy and lowest at the outer edges of the halo. That means that it spends far more time in the halo than in towards the center. Take it that all the particles do that and you have a distribution that has higher density in the halo than in the center. Normal matter, of course, would not act that way because even with the vast distances between object involved, it is at least somewhat likely to smack into something during the trips back and forth so you would not get (and in fact do not get) a normal matter halo around galaxies in the same way that you do for dark matter. [/QUOTE]
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Astronomy and Cosmology
Cosmology
Is the influence of dark matter symmetric?
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