Undergrad Very basic questions about operators in QM

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SUMMARY

The discussion centers on the understanding of operators in quantum mechanics (QM), specifically how wavefunctions represent systems with multiple particles, such as protons and electrons. The wavefunction, denoted as ##\psi_{example}(t, x_{0.1}, x_{0.2}, x_{0.3}, x_{1.1}, x_{1.2}, x_{1.3})##, incorporates time and spatial coordinates, while the probability density is calculated as the square of the absolute value of the wavefunction. Operators applied to wavefunctions yield measurable quantities, and the discussion emphasizes the distinction between eigenfunctions and non-eigenfunctions in relation to momentum measurements. Key equations, such as the expectation value of momentum, are derived and clarified.

PREREQUISITES
  • Understanding of wavefunctions in quantum mechanics
  • Familiarity with operators and their application in QM
  • Knowledge of probability density calculations in quantum systems
  • Basic grasp of eigenvalues and eigenfunctions in quantum mechanics
NEXT STEPS
  • Study the implications of the Heisenberg uncertainty principle in quantum mechanics
  • Learn about the Fourier transform and its role in transitioning between position and momentum representations
  • Explore the concept of expectation values and their calculation in quantum systems
  • Investigate the significance of potential wells and their effect on particle behavior in quantum mechanics
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Students and professionals in physics, particularly those focusing on quantum mechanics, wavefunction analysis, and the mathematical foundations of quantum theory.

  • #31
vanhees71 said:
My recommendation as the introductory QM textbook is

J. J. Sakurai and S. Tuan, Modern Quantum Mechanics,
Addison Wesley (1993).
I took "David J. Griffith, Introduction to Quantum Mechanics". Also tried to read "J. J. Sakurai and S. Tuan, Modern Quantum Mechanics", but "David J. Griffith, Introduction to Quantum Mechanics" seems more easily understandable.
 
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  • #32
PeroK said:
Who needs a textbook when you have @vanhees71 !
True, but sometimes having @vanhees71, makes you realize you should have read your textbook.
 
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