Why does not dark matter gather and form celestial bodies?












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since the only thing we know about dark matter that it "attracts" and affect our Baryonic matter's momentum and speed, which means that it does have mass of a sort.



so why didn't we witness a darkmatter-darkmatter interactions in form of collisions of celestial bodies like stars, Black holes or other distinct things, what do we know about that?



PS: it would be very helpful for me if someone has an answer can cite it with a paper on the topic. thanks in advance!






particle-physics gravity cosmology astrophysics dark-matter







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  • $begingroup$
    Possible duplicates: physics.stackexchange.com/q/214950/2451 and links therein.
    $endgroup$
    – Qmechanic♦
    13 secs ago
















3












$begingroup$


since the only thing we know about dark matter that it "attracts" and affect our Baryonic matter's momentum and speed, which means that it does have mass of a sort.



so why didn't we witness a darkmatter-darkmatter interactions in form of collisions of celestial bodies like stars, Black holes or other distinct things, what do we know about that?



PS: it would be very helpful for me if someone has an answer can cite it with a paper on the topic. thanks in advance!






particle-physics gravity cosmology astrophysics dark-matter







share|cite|improve this question









$endgroup$












  • $begingroup$
    Possible duplicates: physics.stackexchange.com/q/214950/2451 and links therein.
    $endgroup$
    – Qmechanic♦
    13 secs ago














3












3








3





$begingroup$


since the only thing we know about dark matter that it "attracts" and affect our Baryonic matter's momentum and speed, which means that it does have mass of a sort.



so why didn't we witness a darkmatter-darkmatter interactions in form of collisions of celestial bodies like stars, Black holes or other distinct things, what do we know about that?



PS: it would be very helpful for me if someone has an answer can cite it with a paper on the topic. thanks in advance!






particle-physics gravity cosmology astrophysics dark-matter







share|cite|improve this question









$endgroup$




since the only thing we know about dark matter that it "attracts" and affect our Baryonic matter's momentum and speed, which means that it does have mass of a sort.



so why didn't we witness a darkmatter-darkmatter interactions in form of collisions of celestial bodies like stars, Black holes or other distinct things, what do we know about that?



PS: it would be very helpful for me if someone has an answer can cite it with a paper on the topic. thanks in advance!






particle-physics gravity cosmology astrophysics dark-matter




particle-physics gravity cosmology astrophysics dark-matter






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asked 1 hour ago









NimbleDick CrabbNimbleDick Crabb

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  • $begingroup$
    Possible duplicates: physics.stackexchange.com/q/214950/2451 and links therein.
    $endgroup$
    – Qmechanic♦
    13 secs ago


















  • $begingroup$
    Possible duplicates: physics.stackexchange.com/q/214950/2451 and links therein.
    $endgroup$
    – Qmechanic♦
    13 secs ago
















$begingroup$
Possible duplicates: physics.stackexchange.com/q/214950/2451 and links therein.
$endgroup$
– Qmechanic♦
13 secs ago




$begingroup$
Possible duplicates: physics.stackexchange.com/q/214950/2451 and links therein.
$endgroup$
– Qmechanic♦
13 secs ago










1 Answer
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The standard answer is that dark matter does not seem to interact strongly with itself (although self-interacting dark matter is an active research topic), and does not emit electromagnetic radiation. The latter property means that a clump of dark matter cannot lose energy by radiating it away, and will remain a diffuse clump. Ordinary matter can coalesce, heat up, radiate away the energy, and coalesce further. Hence dark matter seems to form diffuse halos that do not form celestial bodies.






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    1 Answer
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    1 Answer
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    active

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    $begingroup$

    The standard answer is that dark matter does not seem to interact strongly with itself (although self-interacting dark matter is an active research topic), and does not emit electromagnetic radiation. The latter property means that a clump of dark matter cannot lose energy by radiating it away, and will remain a diffuse clump. Ordinary matter can coalesce, heat up, radiate away the energy, and coalesce further. Hence dark matter seems to form diffuse halos that do not form celestial bodies.






    share|cite|improve this answer











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      5












      $begingroup$

      The standard answer is that dark matter does not seem to interact strongly with itself (although self-interacting dark matter is an active research topic), and does not emit electromagnetic radiation. The latter property means that a clump of dark matter cannot lose energy by radiating it away, and will remain a diffuse clump. Ordinary matter can coalesce, heat up, radiate away the energy, and coalesce further. Hence dark matter seems to form diffuse halos that do not form celestial bodies.






      share|cite|improve this answer











      $endgroup$
















        5












        5








        5





        $begingroup$

        The standard answer is that dark matter does not seem to interact strongly with itself (although self-interacting dark matter is an active research topic), and does not emit electromagnetic radiation. The latter property means that a clump of dark matter cannot lose energy by radiating it away, and will remain a diffuse clump. Ordinary matter can coalesce, heat up, radiate away the energy, and coalesce further. Hence dark matter seems to form diffuse halos that do not form celestial bodies.






        share|cite|improve this answer











        $endgroup$



        The standard answer is that dark matter does not seem to interact strongly with itself (although self-interacting dark matter is an active research topic), and does not emit electromagnetic radiation. The latter property means that a clump of dark matter cannot lose energy by radiating it away, and will remain a diffuse clump. Ordinary matter can coalesce, heat up, radiate away the energy, and coalesce further. Hence dark matter seems to form diffuse halos that do not form celestial bodies.







        share|cite|improve this answer














        share|cite|improve this answer



        share|cite|improve this answer








        edited 38 mins ago









        innisfree

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        answered 43 mins ago









        Anders SandbergAnders Sandberg

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