chi0_from_gg2_PH

Synopsis:

 triqs_tprf::g2_iw_t chi0_from_gg2_PH (triqs_tprf::g_iw_vt g, triqs_tprf::g2_iw_vt
g2)

Bubble susceptibility \(\chi^{(0)} = GG\) in the Particle-Hole channel

Parameters

• g: single particle Green’s function \(G_{ab}(\nu)\)
• g2: two-particle Green’s function with the mesh to use for \(\chi^{(0)}\)

Return value

chi0 particle-hole bubble

\(\chi^{(0)}_{\bar{a}b\bar{c}d}(\omega, \nu,\nu')\)

Documentation

Computes

(1)\[\chi^{(0)}_{\bar{a}b\bar{c}d}(\omega, \nu, \nu') = - \beta \delta_{\nu, \nu'} G_{da}(\nu) \cdot G_{bc}(\omega + \nu)\]