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Regarding graviton and negative energy

  1. Jan 8, 2014 #1
    Hi. I recently listened to a lecture by Alan Guth, speaking about cosmological inflation. He made the statement that the energy of a gravitational field is negative (followed by a great thought experiment with a collapsing shell of matter to demonstrate this). I am curious; does this mean that the graviton itself would be a particle made of negative energy?? Perhaps I'm over simplifying.
  2. jcsd
  3. Jan 9, 2014 #2
    No, the potential energy of two particles held by some interaction has nothing to do with the energy of the quanta of the interaction field.
  4. Jan 9, 2014 #3


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    This is all a bit speculative as we do not yet know whether there is a particle in existence with the actual properties of a graviton. I guess you could say that a graviton, if it existed, would be 'associated with' negative energy - or at least 'subtractive energy'.
    And what about the photon? The exchange of virtual photons is a possible way of looking at the attractive force between opposite charges. Does imply that a virtual photon is "made of negative energy"?
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