Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Ehrenfest theorem

  1. Oct 26, 2011 #1
    Might be trivial, but: In deriving it, I don't understand how the minus sign comes in to establish the [H,A] commutator. (it seems to me that both partial derivatives of ψ should come out positive)
    For example, in
    http://www.tcm.phy.cam.ac.uk/~bds10/aqp/handout_operator.pdf
    on page 5.
     
  2. jcsd
  3. Oct 26, 2011 #2

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    Search for the G. Frieseke's article on arxiv.org. That's the proof for general self-adjoint operators.
     
  4. Oct 26, 2011 #3
    Lol, those are my lecture notes.

    The minus sign is there because you have the i inside the bra and so when you take its complex conjugate you get a -i.
     
  5. Oct 26, 2011 #4
    right... Thanks!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Ehrenfest theorem
  1. Ehrenfest's Theorem (Replies: 8)

  2. Ehrenfest's Theorem (Replies: 1)

  3. Ehrenfest's Theorem (Replies: 1)

  4. Ehrenfest theorem (Replies: 19)

  5. Ehrenfest Theorem (Replies: 5)

Loading...