sangallidavide
commented
1 month ago Can you please share here the math underlying the INV and RWA integrators?
Andrea, from what I remember, you coded the RWA. :-)
For the INV it comes from yambo_nl. I also attach here the notes sent via email. integrators.pdf
The RWA puzzles me as it should not be an approximation but a rotating frame representation (RWF) that is exact as it eliminates the independent particle oscillations.
Yeap, fully agree. I already commented in the past that it should not be called RWA, since it is not an approximation
Again on the RT_integrators.
Can you please share here the math underlying the INV and RWA integrators?
I can't get the INV math from the suborutines.
The RWA puzzles me as it should not be an approximation but a rotating frame representation (RWF) that is exact as it eliminates the independent particle oscillations.
Actually it is based on the popular solution of a system of first order linear ODEs using diagonalization of the linear coefficient.
https://www.math.uh.edu/~dblecher/EMo.pdf
In the case of G^< the matrix to diagonalize is already diagonal.