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Black holes and darkmatter

  1. Apr 3, 2004 #1
    Just a question on these two topics. If these two objects are so hard to find but they supposedly exist(escpesially dark matter in large amounts). What would the result be if these two came into contact with one another. Would there not be an energetic reaction and would we not be able to detect this?
  2. jcsd
  3. Apr 4, 2004 #2
    There was always a debate about if dark matter was really cold dark matter or hot dark matter, but the WMap sattellite pointed that the favourite candidate is CDM. There are various particles candidates for CDM, neutralinos and axions are the two more mentioned, (axions could even exist forming the so-called axion clusters).
    Axions and neutralinos interact only gravitationally, thus are very difficult to detect. Their difference in mass is appreciable, the neutralino is 100 times heavier than the proton, and the axion has one-trillionth the mass of the electron. However, they do not have other appreciable characteristic, so its absortion by a black hole could not cause any appreciable effect.
    Last edited: Apr 4, 2004
  4. Apr 4, 2004 #3
    Question, is CDM only a theory or is it proven and measurable? Had a hot debate with someone about this the other night... same question with blackholes, are black holes proven? It was my understanding they aren't, b'c even if we sent a probe or something of the like into to gain measurement information, it wouldn't not be able to get out b'c it cannot escape the gravitational force of the black hole.
  5. Apr 4, 2004 #4


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    Black holes are "seen" by their interactions with nearby matter. There is believed to be a gigantic (several million solar masses) one at the center of our galaxy. Check with science news type websites today or tommorow (Spacenow for one).

    Non-baryonic (dark) matter is inferred from gravitational effects. For example galaxies are spiinning too fast to be able to stay together on the amount of baryonic matter present.
  6. Apr 5, 2004 #5


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    Dark matter has been around for ages. Has anyone challenged the Newton-Einstein theory? I actually know there has been in the 1980's by some Milgrim or some guy.
  7. Apr 6, 2004 #6
    I have looked into the "black hole in the middle of our galaxy". This proved to be promising, it explains how galaxies hold together and how our universe moves around. Because of this I am to assume that there is again a larger "black Hole" that the many galaxies revolve around. Scientists are far from that next step but I'd love to know where exactly it all ends or if it continues farther. I believe that if the dark matter came in close enough range to the black hole that it would become part of the hole as everything else seems to, including stars.
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