The Heisenberg Uncertainty Principle
(Δx Δp ≳ ℏ)
• Implies that there really is no such thing as 'a particle is at 𝑥 with momentum 𝑝'
• That is, the more narrow the 𝑥-PDF |Ψ(x)|², the more broad the 𝑝-PDF |Φ(p)|² will become & vice versa (
)pic.twitter.com/6AUqy3Mpt1
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There is some indirect evidence* that Sommerfeld was onto this relationship as early as 1916, which he arrived to by applying Fourier-type reasoning to Bohr's model. *B. Bayman** lectures, Grad Classical Physics course, U of MN, '98/99. (**BB was Wigner's postdoc?)
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