Time dependent perturbation theory for density matrix

[paweld]

Does anyone kown how to apply time dependent perturbation theory to densities
matricies (I'm interested in first order)?
Thanks.

 

[chwie]

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.