Abstract
The operators that represent variables of classical dynamics are built by analogy with classical analogues. (Since the classical description, as we know, can be changed by canonical transformation, this statement implies that in Quantum Mechanics, we must enjoy the same freedom. We shall see later how this arises) Sometimes, there are complications due to the fact that some operators fail to commute; such cases will be noted below. Therefore, for the simple case of one particle in a potential,
is the Hamiltonian operator. By the same criterion, one can write down the Hamiltonian operator for systems of particles.
It is a strange theory that predicts particles that interfere with themselves and propagate through forbidden regions. But that is just what happens in reality.
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Notes
- 1.
Since the classical description, as we know, can be changed by canonical transformation, this statement implies that in Quantum Mechanics, we must enjoy the same freedom. We shall see later how this arises.
- 2.
By the Euler formula, \(\sin (\alpha ) = {e^{i \alpha }-e^{-i \alpha } \over 2 i}\).
- 3.
Werner Heisenberg (Würzburg, 1901-München 1976), received Nobel prize in 1932.
- 4.
Wolfgang Pauli (Vienna 1900-Zurich 1958) received the Nobel prize in 1945.
- 5.
Erwin Schrödinger (Vienna 1887-Vienna 1961) succeeded to Max Planck as professor of Physics in Berlin in 1927; he won the Nobel Prize in 1933.
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Cini, M. (2018). The Eigenvalue Equation and the Evolution Operator. In: Elements of Classical and Quantum Physics. UNITEXT for Physics. Springer, Cham. https://doi.org/10.1007/978-3-319-71330-4_10
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DOI: https://doi.org/10.1007/978-3-319-71330-4_10
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