Are coordinate operators Hermitian?

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Discussion Overview

The discussion revolves around the nature of coordinate operators in quantum mechanics, specifically whether they can be classified as Hermitian. The scope includes theoretical considerations and interpretations within the framework of quantum mechanics.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests that since the coordinates of a one-dimensional free particle are always real-valued, this might imply that the coordinate operator is Hermitian.
  • Another participant argues that coordinate operators are best understood in the Schrödinger picture, where they can be shown to be self-adjoint on their maximal domain of definition.
  • A third participant notes that while the position operator is indeed a coordinate operator, it is not represented as a matrix and requires the framework of Rigged Hilbert Spaces and the Generalized Spectral Theorem for a complete understanding.
  • This participant also warns that a rigorous treatment of these concepts can be quite challenging and suggests starting with more accessible texts before moving to advanced treatments.

Areas of Agreement / Disagreement

Participants express differing views on the classification of coordinate operators as Hermitian, with some supporting the idea based on real-valued coordinates, while others emphasize the need for a more complex mathematical framework. The discussion remains unresolved regarding the definitive classification of these operators.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about the nature of coordinate operators and the mathematical frameworks required for their rigorous treatment. The dependence on definitions and the complexity of the mathematical treatment are acknowledged but not resolved.

Heisenberg
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I can't figure this one out given that the coordinate operator is continuous, it's hard to imagine "matrix elements". But presumably since the coordinates of the system (1d free particle) are always real valued, would this make the coordinate operator Hermitian?
 
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Coordinate operators make most sense and are to be directly interpreted in the Schrödinger picture, where one builds a representation of the canonical commutation relation [x,p] =ihbar on a Hilbert space. One can show that on the maximal domain of definition, these operators are self-adjoint.
 
Sure - its the position operator.

But its not a matrix - it requires Rigged Hilbert Spaces and the Generalized Spectral Theorem to fully flesh out what's going on.

Be warned however the rigorous treatment of such is HARD.

Work your way up to it from Ballentine then a mathematically more orientated treatment like Hall - Quantum Theory For Mathematicians.

Thanks
Bill
 
Thanks for the feedback. I appreciate it.
 

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