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Energy a mathematical expression?! 
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#19
May513, 10:33 PM

P: 50

2. Energy? Or the definition? 3. Why? What about energy in QM? 4. Do explain! In the common world... What is energy in both CM and QM? An ability? A property? What? Or just a measuring tool for the amount of work? Why use the idea of energy? Why do we need if? Why not calculate the Work done and so be it? What's the point of Potential energy? What is our purpose of building mathematical models for energy and not knowing what "energy" is?! The conservation principles are really mind boggling... 


#20
May513, 10:52 PM

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Sci Advisor
PF Gold
P: 9,224

2. The statement that's not a definition. 3. In QM, the Hamiltonian is defined as the generator of translations in time, and we refer to its eigenvalues as "energy". "Work" is a less useful concept in the foundations of QM at least. 4. I thought that my statement was sort of selfexplanatory, or at least that what I said before the list made the meaning clear. 


#21
May613, 04:02 AM

P: 3,890




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