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Thread: What is the relationship between dark matter and black holes?

  1. #1 What is the relationship between dark matter and black holes? 
    ski
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    From my basic understanding, dark matter much like black holes do not emit or absorb light, they are "invisible" to the naked eye and the telescope yet can both be detected by their gravitational pulls. Are black holes a component of dark matter or vice versa?


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  3. #2  
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    I alm not a scientist but AFAIK the hypothesis of stellar black holes to explain dark matter has been discarded due to experiments of micro-lensing. Micro black holes have also been discarded I don't remember why.

    Personaly I liked the idea of stellar black holes. Imagine in the early universe a gigantic chain reaction of supernovae causing the collapse of hydrogen gas that make new giant stars, which themseves end in supernova, etc... Almost all the matter would have quickly ended up in stellar black holes. It would have been spectacular!!!


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    Known black holes are very big. The smaller ones have masses large compared to the sun. Large ones, at the center of galaxies have masses millions or billions times the sun.

    Dark matter consists of unknown microscopic particles, observed though their effect (gravitational) on galaxies and clusters, etc.
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    Black holes are not eliminated completely as a component of dark matter, just as a large component. IOW, some dark matter may be in the form of black holes, but they can't make up a significant fraction of it. A part of the reason for this is big bang nucleo-synthesis. For example, if the universe had at some point in the past had a a lot more hydrogen than it does now and that hydrogen formed stars which then later became black holes, those black holes would have been created in supernovae, and those supernovae would have also created heavier elements. Thus we would see a different distribution of heavy elements to light element in the universe than we see. The distribution of heavy to light elements we see today puts a limit on how much normal matter the universe could have had in the past, and that limit is much smaller than what is needed to account for dark matter.
    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


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