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Losing Heisenbergs constant

  1. Apr 28, 2007 #1
    I'm very confused. Energy can be expressed as:


    So, in Planck units, the energy of the plank mass could be written


    h-bar is in units of m^2 S ^-1 and C is in m s^-1
    In plank units h-bar=Lp^2 Tp^-1 and C=Lp/Tp
    So h-bar.c/Lp=Lp^2. T^-1.Lp.T^-1.Lp^-1 = C^2

    Giving energy for plank mass = C^2 and mass = 1

    Where did Henisenberg’s constant go? How can it be lost by selecting a different form of notation?
  2. jcsd
  3. Apr 28, 2007 #2

    Meir Achuz

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    Any constant with diumension can be transformed away by using suitable dimensions. For instance, if light years are used for distance and years for time,
    c disappears.
  4. Apr 28, 2007 #3
    But surely we can't just "transform away" something like Heisenberg Uncertainty. I'm still missing something incredibly simple here.
  5. Apr 29, 2007 #4

    Meir Achuz

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    The HUP comes from Fourier analysis where \Delta k \Delta x>1/2.
    It is only when you want to talk in terms of momentum rather than k that hbar
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