<p>From Cosmology it is known that a spherical bulge of Dark Matter, that only interacts gravitationally, surrounds the nucleus of each galaxy, that has a spinning disc component of ordinary matter. How (referring to the mechanics of the system) does the gravitational interactions between dark matter and disc matter changes the stability of the disc? Is the disc of each galaxy expected to remain as one? Would it change shape or rotation rates? How is the dark matter behaving kinetically? is it rotating and how would this be related to the main question?</p>

CC BY-SA 4.0
2022-02-15T05:21:18.040Z
When you say disc, are you referring to a dark matter disk in addition to the baryonic matter disk? Or just the relationship between the dark matter bulge and the baryonic disk?
Justin T
CC BY-SA 4.0
2022-02-15T05:25:11.640Z
@JustinTackett I meant to say the last you did: the relationship between the dark matter bulge and the baryonic disk
nuwe
<cosmology><orbital-mechanics><dark-matter>
How does the gravitational interaction between dark a matter bulge and an ordinary matter disk affects stability over time?
nuwe
# How does the gravitational interaction between dark a matter bulge and an ordinary matter disk affects stability over time?

(Asked by: username_0 on 2022-02-15)

From Cosmology it is known that a spherical bulge of Dark Matter, that only interacts gravitationally, surrounds the nucleus of each galaxy, that has a spinning disc component of ordinary matter. How (referring to the mechanics of the system) does the gravitational interactions between dark matter and disc matter changes the stability of the disc? Is the disc of each galaxy expected to remain as one? Would it change shape or rotation rates? How is the dark matter behaving kinetically? is it rotating and how would this be related to the main question?

**Tags:** cosmology, orbital-mechanics, dark-matter

> **Comments:**
> **username_1**: When you say disc, are you referring to a dark matter disk in addition to the baryonic matter disk? Or just the relationship between the dark matter bulge and the baryonic disk?  
> **username_0**: @JustinTackett I meant to say the last you did: the relationship between the dark matter bulge and the baryonic disk  

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