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Uncertain Gravity ?

  1. Jun 21, 2003 #1


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    Greetings !

    The HUP applies within QM. But, the HUP is not part of GR.
    Gravity is not part of QM on the other hand. In QM the only
    method of interaction we deal with is the electromagnetic
    and extended theories deal with the nuclear forces.

    But, what about using Gravity to "violate" the HUP ?
    I know the necessary microscopic scales and the weaknesss
    of Gravity as a force probably prevent us from making any
    relevant experiments, for now. But, how has this specific
    issue been adressed so far ? And what potential experimantal
    ideas exist ?

    Live long and prosper.
  2. jcsd
  3. Jun 21, 2003 #2


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    The basic problem is GR is a "classical" (as opposed to quantum) theory. When they are both important (e.g. black holes), the theory just breaks down. String theory and loop quantum gravity are examples of proposals to resolve this issue. Neither has reached the point that the issue is close to being resolved.
  4. Jun 22, 2003 #3


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    Greetings !

    mathman, I am in general aware of the problems and the
    attempts to solve them. That was not exactly what I meant
    to ask.

    What I am talking about is, for example (and I know it's
    probably practicly impossible with today's technology,
    but I do at least want to know what the predicted results are,
    if any), the double slit experiment where a detector is placed
    near at least one of the slits that uses space-time
    oscillations - gravity waves. Will there be WF collapse for
    an otherwise neutral particle ?

    If the answer is yes then clearly either both theories remain
    correct or GR is partialy flawed and the efforts to unite them
    will be more productive through such experiments (if we could actually conduct them). If the answer is no then clearly both theories are partially incorrect or purhaps just QM and the efforts to change them into a single more succesfull theory will, again, be more productive through such experiments.

    Makes any sense ?

    Live long and prosper.
    Last edited: Jun 22, 2003
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