I Very basic questions about operators in QM

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In quantum mechanics, the wavefunction incorporates all generalized coordinates of a system, such as time and spatial coordinates for particles like protons and electrons. The probability density of finding particles at specific coordinates is derived from the square of the absolute value of the wavefunction. Operators applied to wavefunctions yield values corresponding to the physical quantities being measured, with eigenfunctions providing constant eigenvalues independent of coordinates. Expectation values of observables are calculated through integrals over all spatial coordinates, ensuring they do not depend on specific positions. The discussion emphasizes that in quantum mechanics, the relationship between position and momentum is governed by principles like the Heisenberg uncertainty principle, which complicates direct measurements of momentum at specific coordinates.
  • #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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