How Can Variational Calculus Enhance Your Understanding of Quantum Mechanics?

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Discussion Overview

The discussion centers on the relationship between variational calculus and quantum mechanics, particularly how variational methods can enhance understanding of quantum mechanical concepts. Participants explore resources and textbooks that delve into the mathematical foundations connecting classical mechanics to quantum mechanics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant shares their experience in a Quantum Mechanics course where variational calculus is used to transition from Newtonian to quantum mechanics, seeking recommendations for textbooks that cover this progression in detail.
  • Another participant emphasizes the value of personal insights from instructors, suggesting that such perspectives are often not found in textbooks and encouraging further discussion with the professor.
  • A participant recommends specific books, including one on calculus of variations and its applications, indicating that these resources may be beneficial for understanding the topic.
  • Another participant advises that a solid grasp of calculus and linear algebra is essential, mentioning the importance of Dirac notation and its relation to Hilbert spaces in modern quantum mechanics literature.
  • Several textbooks are suggested, including "Classical Mechanics" by Herbert Goldstein and "Mathematical Methods for Physicists" by Arfken, with notes on their varying levels of complexity.

Areas of Agreement / Disagreement

Participants generally agree on the importance of variational calculus in understanding quantum mechanics and the necessity of foundational mathematics. However, there are multiple suggestions for resources and varying opinions on the best approaches to learning the material.

Contextual Notes

Some participants note the need for a strong background in calculus and linear algebra, but there is no consensus on the best textbooks or methods for integrating variational calculus into quantum mechanics studies.

Who May Find This Useful

Students and educators in physics or mathematical physics, particularly those interested in the mathematical foundations of quantum mechanics and variational calculus.

aliaze1
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I am taking a Quantum Mechanics course this semester and the professor started off by showing us how Newtonian Mechanics lead to Lagrangian Mechanics, then Hamiltonian...etc...until we got to the Quantum Mechanical wave functions.

This was all done in a quantitative sense, using variational calculus. Does anyone know of any good mathematics/physics/mathematical physics textbook that goes into this type of detail for mechanics? I was looking into "Advanced Calculus" by Loomis, since Loomis' Calculus book was amazing, I imagine the Advanced book would be good too..
 
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you have got a very good teacher. many times such personal viewpoints are impossible to find in any book. and taking lessons from classroom is the only way to get such personal viewpoints. so absorb it as much as you can. discuss with the person too. you will not get a chance later on.
 
Of course you'll need some calculus, but I also suggest you get a good understanding of linear algebra. You might also start looking at the Dirac notation (after you study a little linear algebra).
In older QM books you see states expressed in terms of wave functions with integrals, etc. and a lot of calculus. Newer books use more the Dirac notation, which is based on the linear algebra and the fact that you can represent functions in a "Hilbert space"
Books:
"Classical Mechanics" by Herbert Goldstein.
"Mathematical Methods for Physicsists" Arfken.
"Mathematical Methods in the Physical Sciences" is also good. But Arfken is a little more advanced I think. It wouldn't hurt having both.
 

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