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Quantum Volumes

  1. Sep 14, 2005 #1
    Marcus has Highlighted an interesting paper:http://www.arxiv.org/abs/gr-qc/0509049

    But I think it should be here in the Quantum Physics thread, and it definetly should have some discussion?

    Quote here from the paper:

    The first one is what observables (besides the volume) should be specified to actually describe a macroscopic state in a given region. Since the contribution to the volume from a given 4-valent vertex grows like j1 ·j2·j3
    it is important to know whether these observables provide suppression of
    the contribution from very large spins rendering final expectation value of
    the volume finite. The second problem is connected with the first one and
    concerns the bulk entropy: there are many sets of graphs with many different
    assignments of spins on legs that give (macroscopically) the same volume. If
    we specify both the volume and the other observables we are left with a
    certain number of graphs. The question is, whether the logarithm of this
    number is connected with the bulk entropy much as sequences of spins are
    connected with the black hole surface entropy .

    There is/must :rolleyes: be a 'fix' to the authors concerns, any idea's?
  2. jcsd
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