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I Dark Matter Question

  1. Jun 23, 2016 #1
    The dark matter is described as something which can't be detected in any way except for its gravitational attraction.

    My question is: may the dark matter be identified with gravitational field generated by the presence (for short times) of matter and anti-matter which is continually created and annihilated in vacuum space?

    Because I know that some studies shows that this process take place, and it can be measured for its energy as "vacuum energy", but I would like to know if effectively it can also generate a gravitational field.

    Thank you in advance
  2. jcsd
  3. Jun 23, 2016 #2


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    If that were the case, it could not have a presence such as it does. I.e. there would be no dark matter maps such as per the below article.

  4. Jun 23, 2016 #3


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    No. Matter and anti-matter pair creation, or annihilation doesn't violate conservation of mass-energy. It just changes the form of mass-energy. And, all mass-energy gravitates. Moreover, matter-antimatter pairs have electromagnetic charge.
  5. Jun 23, 2016 #4


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    There is no such thing. That is just a pop-science myth.
    Dark energy (which has nothing to do with dark matter apart from the similar name) is probably an energy density of the vacuum (which has a gravitational effect), but it has nothing to do with particle/antiparticle pairs. There is a way to guess its density via quantum field theory, but that leads to a value that is too high by 120 orders of magnitude, so clearly that approach does not work.
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