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What Is Quantum Mechanics

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Bill Hobba

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1 hour ago, Bill Hobba said:

1.   They are conserved - relativity demands it.   In fact, the world lines of each particle must be straight.   For charged particles that is not the case - hence the difficulty.   For momentum to be conserved the field is needed and the field has momentum.   The particles and field have momentum conserved.

2.  It is conserved as per point 1.

So: our common conclusion is now that for both free and interacting particles, the total momentum of a closed system is conserved in the Newtonian, as well as in relativistic mechanics.

For the Wigner Theorem and the No-interaction Theorem this means that, whatever they say [you didn't really specify...], they do not, in fact, imply non-conservation.

PS: Your justifications/comments to point #1 seem extremely confusing to me. We can discuss this, if you wish.

Edited by AlexL
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The Foundations of Quantum Mechanics by Roderich Tumulka

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This book introduces and critically appraises the main proposals for how to understand quantum mechanics, namely the Copenhagen interpretation, spontaneous collapse, Bohmian mechanics, many-worlds, and others. The author makes clear what are the crucial problems, such as the measurement problem, related to the foundations of quantum mechanics and explains the key arguments like the Einstein-Podolsky-Rosen argument and Bell’s proof of nonlocality. He discusses and clarifies numerous topics that have puzzled the founding fathers of quantum mechanics and present-day students alike, such as the possibility of hidden variables, the collapse of the wave function, time-of-arrival measurements, explanations of the symmetrization postulate for identical particles, or the nature of spin. Several chapters are devoted to extending the different approaches to relativistic space-time and quantum field theory. The book is self-contained and is intended for graduate students and researchers who want to step into the fundamental aspects of quantum physics. Given its clarity, it is accessible also to advanced undergraduates and contains many exercises and examples to master the subject.

 

Edited by Boydstun
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