Recent content by jonnaraev

  1. J

    Product rule of derivative of expectation values

    Thanks for the answers. I ended up using Ehrenfest's theorem, and straight-forward calculation of the commutator with the Hamiltonian. @dextercioby: So you're saying Ehrenfest doesn't even apply here? Is it only true in general for self-adjoint operators? Do you have an example of a case where...
  2. J

    Product rule of derivative of expectation values

    Thanks. Google failed me, so I couldn't find any documentation. Happy to know my instincts weren't all off.
  3. J

    Product rule of derivative of expectation values

    Hello, first post here. I am preparing for my Introductory Quantum Mechanics course, and in the exam questions, we are asked to use Ehrenfest's theorem to show that \frac{d}{dt}\langle \vec{r}\cdot \vec{p} \rangle = \langle 2T-\vec{r}\cdot \nabla V \rangle Now, from other results...
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