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måndag 17 mars 2014

New Uncertainty Principle as Wien's Displacement Law


The recent series of posts based on Computational Blackbody Radiation suggest that Heisenberg's Uncertainty Principle can be understood as a consequence of Wien's Displacement Law expressing high-frequency cut-off in blackbody radiation scaling with temperature according to Planck's radiation law:
  • B_\nu (T)=\gamma\nu^2T\times \theta(\nu ,T),
where B_\nu (T) is radiated energy per unit frequency, surface area, viewing angle and second, \gamma =\frac{2k}{c^2} where k = 1.3806488\times  10^{-23} m^2 kg/s^2 K is Boltzmann's constant and c the speed of light in m/s, T is temperature in Kelvin K,
  • \theta (\nu ,T)=\frac{\alpha}{e^\alpha -1}
  • \alpha=\frac{h\nu}{kT},
where \theta (\nu ,T)\approx 1 for \alpha < 1 and \theta (\nu ,T)\approx 0 for \alpha > 10 as high frequency cut-off with h=6.626\times 10^{-34}\, Js Planck's constant. More precisely, maximal radiance for a given temperature occurs T for \alpha \approx 2.821 with corresponding frequency
  • \nu_{max} = 2.821\frac{T}{\hat h} where \hat h=\frac{h}{k}=4.8\times 10^{-11}\, Ks
with a rapid drop for \nu >\nu_{max}.

The proof of Planck's Law in Computational Blackbody Radiation explains the high frequency cut-off as a consequence of finite precision computation introducing a dissipative effect damping high-frequencies.

A connection to Heisenbergs Uncertainty Principle can be made by noting that a high-frequency cut-off condition of the form
  • \nu < \frac{T}{\hat h},
can be rephrased in the following form connecting to Heisenberg's Uncertainty Principle:
  • u_\nu\dot u_\nu > \hat h                  (New Uncertainty Principle)
where u_\nu is position amplitude, \dot u_\nu =\nu u_\nu is velocity amplitude of a wave of frequency \nu with \dot u_\nu^2 =T.

The New Uncertainty Principle expresses that observation/detection of a wave, that is observation/detection of amplitude u and frequency \nu =\frac{\dot u}{u} of a wave, requires
  • u\dot u>\hat h.
The New Uncertainty Principle concerns observation/detection amplitude and frequency as physical aspects of wave motion, and not as Heisenberg's Uncertainty Principle particle position and wave frequency as unphysical complementary aspects.

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