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A Can black holes convert matter/dark matter?

  1. Sep 13, 2016 #1
    Can black holes convert dark matter into matter and vice versa?

    Presumably, a black hole can gain its mass from eating normal matter, or dark matter, or light. Then, it will eventually evaporate into Hawking radiation. I guess the Hawking radiation should include light as well as both matter and dark matter particles.

    Is a black hole made of matter exactly the same as a black hole made of dark matter? Could dark matter possess a "dark charge" which alters the black hole metric analogous to the Reissner-Nordstrom metric?
     
  2. jcsd
  3. Sep 13, 2016 #2

    phinds

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    no, stuff just falls in.

    yes
    yes
    No, Hawking radiation is not particles it is electromagnetic radiation.

    Yes, you can't tell any difference at all.
     
  4. Sep 13, 2016 #3
    Oh? I thought it was a thermal mix of all particles. Photons just happen to be the most likely, due to having zero mass.
     
  5. Sep 13, 2016 #4
    I don't think anyone knows what dark matter is or what really happens inside a black hole. General Relativity is the usual model that is used for black holes but it is silent about what constitutes dark matter. Also GR predicts a singularity in the black hole but I don't think anyone seriously believes that this is physically the case.

    Cheers
     
  6. Sep 18, 2016 #5
    We all know what really goes on in those Black Holes
    tesseract.jpg
     
  7. Sep 18, 2016 #6

    Nugatory

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    We don't know for sure what the stuff is, so we can't make authoritative pronouncements about its properties.

    But seeing as how the evidence for its existence is observation of gravitational effects consistent with there being more mass in some volumes of space than is accounted for by the matter that we can see.... The simplest and most obvious hypothesis is that it gravitates just like all other matter, and what makes it "dark" is just that it's not readily detectably through any of our traditional methods.
     
  8. Sep 18, 2016 #7

    Nugatory

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    Khashishi is right.....

    Although for a stellar-mass black hole "most likely" is an huge enormous understatement. These things are radiating like a black body just barely above zero degrees Kelvin, and that's nowhere near energetic enough to have any discernible probability of producing massive particles. It gets more exciting with much smaller and hotter black holes.
     
    Last edited: Sep 18, 2016
  9. Sep 18, 2016 #8

    phinds

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    Thanks for that correction.
     
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