gftool.pole_gf_ret_t

gftool.pole_gf_ret_t(tt, poles, weights)

Retarded time Green’s function given by a finite number of poles.

Parameters:

tt : (…) float array_like

Green’s function is evaluated at times tt, for tt<0 it is 0.

poles, weights : (…, N) float array_like or float

Position and weight of the poles.

Returns:

pole_gf_ret_t : (…) float np.ndarray

Retarded time Green’s function.

See also

pole_gf_z

corresponding commutator Green’s function