Why is the distribution of dark matter in a Galaxy different from the distribution of normal matter?Is dark matter around the Milky Way spread in a spiral shape (or, in a different shape)?Distribution of Dark Matter around galaxiesWhy doesn't the dark matter halo co-rotate with the luminous disk? What keeps it from falling into the center if not angular momentum?Why is the galaxy's dark matter halo a sphere instead of a disk?How long would it take for a galaxy to collapse without dark matter?Galactic Rotation Speeds - Ehrenfest Paradox, Gravitational time dilation, Dark Matter - all of the above?Distribution of dark matter in galactic halosDensity of dark matter along the galaxyIs dark matter really there?Current constraints on Dark Matter self-interaction from galactic profilesWhy does dark matter form halos?Dark matter halo distribution for simple galaxy modelCould dark matter be made of black holes?Could dark matter consist of the supermassive black holes at the centers of galaxies?
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Why is the distribution of dark matter in a Galaxy different from the distribution of normal matter?
Is dark matter around the Milky Way spread in a spiral shape (or, in a different shape)?Distribution of Dark Matter around galaxiesWhy doesn't the dark matter halo co-rotate with the luminous disk? What keeps it from falling into the center if not angular momentum?Why is the galaxy's dark matter halo a sphere instead of a disk?How long would it take for a galaxy to collapse without dark matter?Galactic Rotation Speeds - Ehrenfest Paradox, Gravitational time dilation, Dark Matter - all of the above?Distribution of dark matter in galactic halosDensity of dark matter along the galaxyIs dark matter really there?Current constraints on Dark Matter self-interaction from galactic profilesWhy does dark matter form halos?Dark matter halo distribution for simple galaxy modelCould dark matter be made of black holes?Could dark matter consist of the supermassive black holes at the centers of galaxies?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
The dynamics of a galaxy are driven by gravity. And dark matter experiences the same gravitational forces as normal matter. The effects of other forces are very small in comparison. So why is the distribution of dark and normal matter so different?
I am not asking whether the DM distribution is different - that's taken as an observed fact. I'm asking how it could have got that way.
newtonian-gravity orbital-motion dark-matter galaxies galaxy-rotation-curve
asked Jun 9 at 23:58
RogerJBarlowRogerJBarlow
3,8588 silver badges23 bronze badges
$endgroup$
|
show 2 more comments
$begingroup$
The dynamics of a galaxy are driven by gravity. And dark matter experiences the same gravitational forces as normal matter. The effects of other forces are very small in comparison. So why is the distribution of dark and normal matter so different?
I am not asking whether the DM distribution is different - that's taken as an observed fact. I'm asking how it could have got that way.
newtonian-gravity orbital-motion dark-matter galaxies galaxy-rotation-curve
asked Jun 9 at 23:58
RogerJBarlowRogerJBarlow
3,8588 silver badges23 bronze badges
$endgroup$
$begingroup$
Related questions: physics.stackexchange.com/q/220058/56299, physics.stackexchange.com/q/15226/56299, physics.stackexchange.com/q/25504/56299, physics.stackexchange.com/q/46634/56299, and links therein.
$endgroup$
– HDE 226868
Jun 10 at 0:02
2
$begingroup$
Possible duplicate of Is dark matter around the Milky Way spread in a spiral shape (or, in a different shape)?
$endgroup$
– Bones
Jun 10 at 3:56
$begingroup$
In all the link indicated as possible duplicate, i cannot find the answer o even a hint toward the answer to this question.
$endgroup$
– GiorgioP
Jun 10 at 4:46
$begingroup$
@GiorgioP the accepted answer in the one Bones gives is basically identical to niels answer here...
$endgroup$
– Kyle Kanos
Jun 10 at 11:39
$begingroup$
@KyleKanos I do not find equivalent neither the questions nor the answers. There the emphasize of the question is on "how", here on "why". There the answer is a little ambiguous as far as the "why" (compare the accepted answer and the following OmegaCentauri's comment: eveybody would remain with some doubts about what kind of interactions DM is capable of ). I remain with my opinion that there is no duplicate (although the questions touches related issues).
$endgroup$
– GiorgioP
Jun 10 at 17:34
|
show 2 more comments
$begingroup$
The dynamics of a galaxy are driven by gravity. And dark matter experiences the same gravitational forces as normal matter. The effects of other forces are very small in comparison. So why is the distribution of dark and normal matter so different?
I am not asking whether the DM distribution is different - that's taken as an observed fact. I'm asking how it could have got that way.
newtonian-gravity orbital-motion dark-matter galaxies galaxy-rotation-curve
asked Jun 9 at 23:58
RogerJBarlowRogerJBarlow
3,8588 silver badges23 bronze badges
$endgroup$
The dynamics of a galaxy are driven by gravity. And dark matter experiences the same gravitational forces as normal matter. The effects of other forces are very small in comparison. So why is the distribution of dark and normal matter so different?
I am not asking whether the DM distribution is different - that's taken as an observed fact. I'm asking how it could have got that way.
newtonian-gravity orbital-motion dark-matter galaxies galaxy-rotation-curve
newtonian-gravity orbital-motion dark-matter galaxies galaxy-rotation-curve
asked Jun 9 at 23:58
RogerJBarlowRogerJBarlow
3,8588 silver badges23 bronze badges
asked Jun 9 at 23:58
RogerJBarlowRogerJBarlow
3,8588 silver badges23 bronze badges
edited Jun 10 at 9:53
RogerJBarlow
asked Jun 9 at 23:58
RogerJBarlowRogerJBarlow
3,8588 silver badges23 bronze badges
asked Jun 9 at 23:58
RogerJBarlowRogerJBarlow
3,8588 silver badges23 bronze badges
asked Jun 9 at 23:58
RogerJBarlowRogerJBarlow
3,8588 silver badges23 bronze badges
3,8588 silver badges23 bronze badges
$begingroup$
Related questions: physics.stackexchange.com/q/220058/56299, physics.stackexchange.com/q/15226/56299, physics.stackexchange.com/q/25504/56299, physics.stackexchange.com/q/46634/56299, and links therein.
$endgroup$
– HDE 226868
Jun 10 at 0:02
2
$begingroup$
Possible duplicate of Is dark matter around the Milky Way spread in a spiral shape (or, in a different shape)?
$endgroup$
– Bones
Jun 10 at 3:56
$begingroup$
In all the link indicated as possible duplicate, i cannot find the answer o even a hint toward the answer to this question.
$endgroup$
– GiorgioP
Jun 10 at 4:46
$begingroup$
@GiorgioP the accepted answer in the one Bones gives is basically identical to niels answer here...
$endgroup$
– Kyle Kanos
Jun 10 at 11:39
$begingroup$
@KyleKanos I do not find equivalent neither the questions nor the answers. There the emphasize of the question is on "how", here on "why". There the answer is a little ambiguous as far as the "why" (compare the accepted answer and the following OmegaCentauri's comment: eveybody would remain with some doubts about what kind of interactions DM is capable of ). I remain with my opinion that there is no duplicate (although the questions touches related issues).
$endgroup$
– GiorgioP
Jun 10 at 17:34
|
show 2 more comments
$begingroup$
Related questions: physics.stackexchange.com/q/220058/56299, physics.stackexchange.com/q/15226/56299, physics.stackexchange.com/q/25504/56299, physics.stackexchange.com/q/46634/56299, and links therein.
$endgroup$
– HDE 226868
Jun 10 at 0:02
2
$begingroup$
Possible duplicate of Is dark matter around the Milky Way spread in a spiral shape (or, in a different shape)?
$endgroup$
– Bones
Jun 10 at 3:56
$begingroup$
In all the link indicated as possible duplicate, i cannot find the answer o even a hint toward the answer to this question.
$endgroup$
– GiorgioP
Jun 10 at 4:46
$begingroup$
@GiorgioP the accepted answer in the one Bones gives is basically identical to niels answer here...
$endgroup$
– Kyle Kanos
Jun 10 at 11:39
$begingroup$
@KyleKanos I do not find equivalent neither the questions nor the answers. There the emphasize of the question is on "how", here on "why". There the answer is a little ambiguous as far as the "why" (compare the accepted answer and the following OmegaCentauri's comment: eveybody would remain with some doubts about what kind of interactions DM is capable of ). I remain with my opinion that there is no duplicate (although the questions touches related issues).
$endgroup$
– GiorgioP
Jun 10 at 17:34
$begingroup$
Related questions: physics.stackexchange.com/q/220058/56299, physics.stackexchange.com/q/15226/56299, physics.stackexchange.com/q/25504/56299, physics.stackexchange.com/q/46634/56299, and links therein.
$endgroup$
– HDE 226868
Jun 10 at 0:02
$begingroup$
Related questions: physics.stackexchange.com/q/220058/56299, physics.stackexchange.com/q/15226/56299, physics.stackexchange.com/q/25504/56299, physics.stackexchange.com/q/46634/56299, and links therein.
$endgroup$
– HDE 226868
Jun 10 at 0:02
2
2
$begingroup$
Possible duplicate of Is dark matter around the Milky Way spread in a spiral shape (or, in a different shape)?
$endgroup$
– Bones
Jun 10 at 3:56
$begingroup$
Possible duplicate of Is dark matter around the Milky Way spread in a spiral shape (or, in a different shape)?
$endgroup$
– Bones
Jun 10 at 3:56
$begingroup$
In all the link indicated as possible duplicate, i cannot find the answer o even a hint toward the answer to this question.
$endgroup$
– GiorgioP
Jun 10 at 4:46
$begingroup$
In all the link indicated as possible duplicate, i cannot find the answer o even a hint toward the answer to this question.
$endgroup$
– GiorgioP
Jun 10 at 4:46
$begingroup$
@GiorgioP the accepted answer in the one Bones gives is basically identical to niels answer here...
$endgroup$
– Kyle Kanos
Jun 10 at 11:39
$begingroup$
@GiorgioP the accepted answer in the one Bones gives is basically identical to niels answer here...
$endgroup$
– Kyle Kanos
Jun 10 at 11:39
$begingroup$
@KyleKanos I do not find equivalent neither the questions nor the answers. There the emphasize of the question is on "how", here on "why". There the answer is a little ambiguous as far as the "why" (compare the accepted answer and the following OmegaCentauri's comment: eveybody would remain with some doubts about what kind of interactions DM is capable of ). I remain with my opinion that there is no duplicate (although the questions touches related issues).
$endgroup$
– GiorgioP
Jun 10 at 17:34
$begingroup$
@KyleKanos I do not find equivalent neither the questions nor the answers. There the emphasize of the question is on "how", here on "why". There the answer is a little ambiguous as far as the "why" (compare the accepted answer and the following OmegaCentauri's comment: eveybody would remain with some doubts about what kind of interactions DM is capable of ). I remain with my opinion that there is no duplicate (although the questions touches related issues).
$endgroup$
– GiorgioP
Jun 10 at 17:34
|
show 2 more comments
2 Answers
2
active
oldest
votes
$begingroup$
In the case of conventional matter, particles, atoms and molecules of it can interact electromagnetically and share energy, and they can do so in response to the effects of gravity. For example, in a (gravity-driven) accretion disc, the infalling matter particles interact strongly amongst themselves and get hot; then that heat gets radiated away and the radiating particles then cool and fall further into the gravity well. In other words, they can shed energy and then gravitationally collapse.
Dark matter does not interact electromagnetically, and thus is denied this mechanism of dissipative collapse.
This difference means that the luminous matter in a galaxy can be expected to distribute itself differently than the dark matter in that same galaxy.
answered Jun 10 at 6:24
niels nielsenniels nielsen
23.3k5 gold badges32 silver badges66 bronze badges
$endgroup$
$begingroup$
Would a discussion of the entropy involved also be illuminating?
$endgroup$
– Yakk
Jun 10 at 17:43
$begingroup$
Possibly, but I'm not the guy to provide it.
$endgroup$
– niels nielsen
Jun 11 at 0:18
add a comment |
$begingroup$
Three scenarios come to mind that could cause this. The first is an unstable or inconsistent gravitational pull from dark matter that could act as a kind of slingshot to the matter it pulled on. The second would be that the dark matter was dragged/blown away to some new location perhaps by neutrinos. The third would be a combination of the two. Think of DM behaving like other quantum particles and that its formation and destruction is a consequence of the fabric of reality. To be clear i make no claim to the validity of these guesses.
I believe the most commonly accepted cause is that visible matter tugs back and this causes dark matter to get thrown around as much as the stuff we can see.
answered Jun 10 at 21:25
user234287user234287
1
$endgroup$
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
In the case of conventional matter, particles, atoms and molecules of it can interact electromagnetically and share energy, and they can do so in response to the effects of gravity. For example, in a (gravity-driven) accretion disc, the infalling matter particles interact strongly amongst themselves and get hot; then that heat gets radiated away and the radiating particles then cool and fall further into the gravity well. In other words, they can shed energy and then gravitationally collapse.
Dark matter does not interact electromagnetically, and thus is denied this mechanism of dissipative collapse.
This difference means that the luminous matter in a galaxy can be expected to distribute itself differently than the dark matter in that same galaxy.
answered Jun 10 at 6:24
niels nielsenniels nielsen
23.3k5 gold badges32 silver badges66 bronze badges
$endgroup$
$begingroup$
Would a discussion of the entropy involved also be illuminating?
$endgroup$
– Yakk
Jun 10 at 17:43
$begingroup$
Possibly, but I'm not the guy to provide it.
$endgroup$
– niels nielsen
Jun 11 at 0:18
add a comment |
$begingroup$
In the case of conventional matter, particles, atoms and molecules of it can interact electromagnetically and share energy, and they can do so in response to the effects of gravity. For example, in a (gravity-driven) accretion disc, the infalling matter particles interact strongly amongst themselves and get hot; then that heat gets radiated away and the radiating particles then cool and fall further into the gravity well. In other words, they can shed energy and then gravitationally collapse.
Dark matter does not interact electromagnetically, and thus is denied this mechanism of dissipative collapse.
This difference means that the luminous matter in a galaxy can be expected to distribute itself differently than the dark matter in that same galaxy.
answered Jun 10 at 6:24
niels nielsenniels nielsen
23.3k5 gold badges32 silver badges66 bronze badges
$endgroup$
$begingroup$
Would a discussion of the entropy involved also be illuminating?
$endgroup$
– Yakk
Jun 10 at 17:43
$begingroup$
Possibly, but I'm not the guy to provide it.
$endgroup$
– niels nielsen
Jun 11 at 0:18
add a comment |
$begingroup$
In the case of conventional matter, particles, atoms and molecules of it can interact electromagnetically and share energy, and they can do so in response to the effects of gravity. For example, in a (gravity-driven) accretion disc, the infalling matter particles interact strongly amongst themselves and get hot; then that heat gets radiated away and the radiating particles then cool and fall further into the gravity well. In other words, they can shed energy and then gravitationally collapse.
Dark matter does not interact electromagnetically, and thus is denied this mechanism of dissipative collapse.
This difference means that the luminous matter in a galaxy can be expected to distribute itself differently than the dark matter in that same galaxy.
answered Jun 10 at 6:24
niels nielsenniels nielsen
23.3k5 gold badges32 silver badges66 bronze badges
$endgroup$
In the case of conventional matter, particles, atoms and molecules of it can interact electromagnetically and share energy, and they can do so in response to the effects of gravity. For example, in a (gravity-driven) accretion disc, the infalling matter particles interact strongly amongst themselves and get hot; then that heat gets radiated away and the radiating particles then cool and fall further into the gravity well. In other words, they can shed energy and then gravitationally collapse.
Dark matter does not interact electromagnetically, and thus is denied this mechanism of dissipative collapse.
This difference means that the luminous matter in a galaxy can be expected to distribute itself differently than the dark matter in that same galaxy.
answered Jun 10 at 6:24
niels nielsenniels nielsen
23.3k5 gold badges32 silver badges66 bronze badges
answered Jun 10 at 6:24
niels nielsenniels nielsen
23.3k5 gold badges32 silver badges66 bronze badges
answered Jun 10 at 6:24
niels nielsenniels nielsen
23.3k5 gold badges32 silver badges66 bronze badges
answered Jun 10 at 6:24
niels nielsenniels nielsen
23.3k5 gold badges32 silver badges66 bronze badges
23.3k5 gold badges32 silver badges66 bronze badges
$begingroup$
Would a discussion of the entropy involved also be illuminating?
$endgroup$
– Yakk
Jun 10 at 17:43
$begingroup$
Possibly, but I'm not the guy to provide it.
$endgroup$
– niels nielsen
Jun 11 at 0:18
add a comment |
$begingroup$
Would a discussion of the entropy involved also be illuminating?
$endgroup$
– Yakk
Jun 10 at 17:43
$begingroup$
Possibly, but I'm not the guy to provide it.
$endgroup$
– niels nielsen
Jun 11 at 0:18
$begingroup$
Would a discussion of the entropy involved also be illuminating?
$endgroup$
– Yakk
Jun 10 at 17:43
$begingroup$
Would a discussion of the entropy involved also be illuminating?
$endgroup$
– Yakk
Jun 10 at 17:43
$begingroup$
Possibly, but I'm not the guy to provide it.
$endgroup$
– niels nielsen
Jun 11 at 0:18
$begingroup$
Possibly, but I'm not the guy to provide it.
$endgroup$
– niels nielsen
Jun 11 at 0:18
add a comment |
$begingroup$
Three scenarios come to mind that could cause this. The first is an unstable or inconsistent gravitational pull from dark matter that could act as a kind of slingshot to the matter it pulled on. The second would be that the dark matter was dragged/blown away to some new location perhaps by neutrinos. The third would be a combination of the two. Think of DM behaving like other quantum particles and that its formation and destruction is a consequence of the fabric of reality. To be clear i make no claim to the validity of these guesses.
I believe the most commonly accepted cause is that visible matter tugs back and this causes dark matter to get thrown around as much as the stuff we can see.
answered Jun 10 at 21:25
user234287user234287
1
$endgroup$
add a comment |
$begingroup$
Three scenarios come to mind that could cause this. The first is an unstable or inconsistent gravitational pull from dark matter that could act as a kind of slingshot to the matter it pulled on. The second would be that the dark matter was dragged/blown away to some new location perhaps by neutrinos. The third would be a combination of the two. Think of DM behaving like other quantum particles and that its formation and destruction is a consequence of the fabric of reality. To be clear i make no claim to the validity of these guesses.
I believe the most commonly accepted cause is that visible matter tugs back and this causes dark matter to get thrown around as much as the stuff we can see.
answered Jun 10 at 21:25
user234287user234287
1
$endgroup$
add a comment |
$begingroup$
Three scenarios come to mind that could cause this. The first is an unstable or inconsistent gravitational pull from dark matter that could act as a kind of slingshot to the matter it pulled on. The second would be that the dark matter was dragged/blown away to some new location perhaps by neutrinos. The third would be a combination of the two. Think of DM behaving like other quantum particles and that its formation and destruction is a consequence of the fabric of reality. To be clear i make no claim to the validity of these guesses.
I believe the most commonly accepted cause is that visible matter tugs back and this causes dark matter to get thrown around as much as the stuff we can see.
answered Jun 10 at 21:25
user234287user234287
1
$endgroup$
Three scenarios come to mind that could cause this. The first is an unstable or inconsistent gravitational pull from dark matter that could act as a kind of slingshot to the matter it pulled on. The second would be that the dark matter was dragged/blown away to some new location perhaps by neutrinos. The third would be a combination of the two. Think of DM behaving like other quantum particles and that its formation and destruction is a consequence of the fabric of reality. To be clear i make no claim to the validity of these guesses.
I believe the most commonly accepted cause is that visible matter tugs back and this causes dark matter to get thrown around as much as the stuff we can see.
answered Jun 10 at 21:25
user234287user234287
1
answered Jun 10 at 21:25
user234287user234287
1
answered Jun 10 at 21:25
user234287user234287
1
answered Jun 10 at 21:25
user234287user234287
1
1
add a comment |
add a comment |
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Related questions: physics.stackexchange.com/q/220058/56299, physics.stackexchange.com/q/15226/56299, physics.stackexchange.com/q/25504/56299, physics.stackexchange.com/q/46634/56299, and links therein.
$endgroup$
– HDE 226868
Jun 10 at 0:02
2
$begingroup$
Possible duplicate of Is dark matter around the Milky Way spread in a spiral shape (or, in a different shape)?
$endgroup$
– Bones
Jun 10 at 3:56
$begingroup$
In all the link indicated as possible duplicate, i cannot find the answer o even a hint toward the answer to this question.
$endgroup$
– GiorgioP
Jun 10 at 4:46
$begingroup$
@GiorgioP the accepted answer in the one Bones gives is basically identical to niels answer here...
$endgroup$
– Kyle Kanos
Jun 10 at 11:39
$begingroup$
@KyleKanos I do not find equivalent neither the questions nor the answers. There the emphasize of the question is on "how", here on "why". There the answer is a little ambiguous as far as the "why" (compare the accepted answer and the following OmegaCentauri's comment: eveybody would remain with some doubts about what kind of interactions DM is capable of ). I remain with my opinion that there is no duplicate (although the questions touches related issues).
$endgroup$
– GiorgioP
Jun 10 at 17:34