keldysh formalism

keldysh formalism

הודעהעל ידי kleeorin » 17:18 10/02/2013

in Mahan, the expression for G lesser is: which is not what we talked about before
this means that in order to identify the lesser self energy i also have to know how the retarted (advanced) self energy must look like - which is no difficult in our case but might take time in other cases. is this true?

the second order (which is what im calculatng right now) ill get (im almost there). but why is mahan careful with their order? order doesnt matter anymore, right?

thanks in advance
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