triqs_ctint.post_process.chi2_from_chi2_conn_PP

triqs_ctint.post_process.chi2_from_chi2_conn_PP()

Dispatched C++ function(s).

[1] (chi2_conn_tau: Block2Gf[MeshImTime, 4],
     G_iw: BlockGf[MeshImFreq, 2],
     dens_G: [ndarray[float, 2]])
  -> Block2Gf[MeshImTime, 4]

Calculate the two-point correlator \(\chi^{(2)}\) in the particle-particle channel.

Adds the disconnected contribution, built from the interacting Green’s function \(G\) and the density, to the connected \(\chi^{(2)}\) in imaginary time.

Parameters:

chi2_conn_tauBlock2Gf[MeshImTime, 4]

The connected correlator \(\chi^{(2)}_{conn}(\tau)\) in imaginary time.

G_iwBlockGf[MeshImFreq, 2]

The interacting Green’s function \(G(i\omega)\).

dens_G[ndarray[float, 2]]

The density obtained from the interacting Green’s function \(G\).

Returns:

Block2Gf[MeshImTime, 4]

The two-point correlator \(\chi^{(2)}_{pp}(\tau)\) in the particle-particle channel.