Parameter: nbfrq
Definition
Number of bosonic Matsubara frequency points for the two-particle green's function.
The two-particle Green's function $\chi(i\omega_n, i\omega'_n, i\nu_n)$ and vertex function $\mathcal{F}(i\omega_n, i\omega'_n, i\nu_n)$ have three frequency indices where $\omega_n$ and $\omega'_n$ are fermionic frequencies, and $\nu_n$ bosonic frequency:
\[\nu_n = \frac{2n\pi}{\beta}\]
\[\omega_n = \frac{(2n+1)\pi}{\beta}\]
The nbfrq parameter is used to define and generate $\nu_n$ bosonic mesh. The corresponding $\omega_n$ fermionic mesh is defined by the nffrq parameter.
Type
Integer
Default value
8
Component
Only for the GARDENIA, NARCISSUS, CAMELLIA, LAVENDER, and MANJUSHAKA components.
Behavior
Determine the size of involved arrays. Only useful when we need to compute the two-particle quantities.
Comment
If the nbfrq is too large, the computational time is not bearable. So we recommend to set nbfrq $\leq 32$ The computation of two-particle quantities is extremely time-consuming, though we have tried our best optimizing it.
See nffrq and nfreq for more details.
The computation of two-particle quantities has been optimized using the OpenMP multi-thread technology. You can enable this feature in the compiling procedure. See also Compiling environment for more details.