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On vaccum energy

  1. Jul 29, 2011 #1
    I initially thought of posting this thread in cosmology section but then I realised it's much more general in scope,so Iam posting it here.

    Massive bodies attract gravitationally and mass-energy equivalence implies that energy contributes to gravitational attraction.

    Then what's so peculiar about vaccum energy that it gives rise to gravitational repulsion instead of attraction?
    Is this because of some kind of internal structure it has,which is somehow producing repulsion at the microscopic scale.
    Or is it a mere fact that has been observed experimentally(expanding universe etc.) and no theoretical justification yet.

    Isn't the term vaccum energy itself a misnomer?
  2. jcsd
  3. Jul 29, 2011 #2
    It is not a misnomer. Vacuum (not vaccum =) ) energy is the background energy that exists in space even when there is nothing else in that space (basically a vacuum).

    You could read http://en.wikipedia.org/wiki/Vacuum_energy to know more.
  4. Jul 30, 2011 #3
    Oops,sorry for spelling(I didn't realised that).But the wikipedia article hardly explain anything that I asked for.
    Last edited: Jul 30, 2011
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