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Time dependent perturbation theory for density matrix

  1. Jul 17, 2010 #1
    Does anyone kown how to apply time dependent perturbation theory to densities
    matricies (I'm interested in first order)?
  2. jcsd
  3. Apr 28, 2011 #2
    Yes I know I am late, but for future reference. The idea is to use the Louisville's equation in the interaction picture ( can be found in wiki in interaction picture). Then you transform the equation into a integral equation and substitute it again in the Louisville's equation. Repeat the process for higher orders. I hope this helps.
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