triqs.gfs.tools.dyson
- triqs.gfs.tools.dyson(**kwargs)[source]
Solve Dyson’s equation for the missing quantity.
Given exactly two of \(G_0\), \(G\) and \(\Sigma\), return the third using
\[G^{-1} = G_0^{-1} - \Sigma.\]- Parameters:
- G0_iwGf or BlockGf, optional
Non-interacting Green’s function.
- G_iwGf or BlockGf, optional
Interacting Green’s function.
- Sigma_iwGf or BlockGf, optional
Self-energy.
- Returns:
- Gf or BlockGf
The remaining quantity, of the same type as the inputs.
- Raises:
- ValueError
If fewer or more than two of the three keyword arguments are provided.
Examples
>>> from triqs.gfs import dyson >>> Sigma_iw = dyson(G0_iw=G0_iw, G_iw=G_iw) >>> G_iw = dyson(G0_iw=G0_iw, Sigma_iw=Sigma_iw)