triqs.gfs.descriptors

Concrete Green’s function descriptors used with the << operator.

This module provides the ready-made descriptors that fill a Green’s function with a closed-form expression:

• SemiCircular — Hilbert transform of a semicircular DOS.

• Flat (alias Wilson) — Hilbert transform of a flat DOS with cutoff.

• Fourier — lazy Fourier transform between conjugate meshes.

• LegendreToMatsubara, MatsubaraToLegendre — lazy basis transforms.

• OneFermionInTime — a one-fermion imaginary-time propagator.

The frequency placeholders Omega and iOmega_n and the Function / Const descriptors are re-exported from triqs.gfs.descriptor_base.

See Also: __lshift__() – Operator that applies a descriptor.

Functions

semi(x)

Return \(\omega \mapsto \rho(\omega)\) for a semicircular DOS with the given half-bandwidth.

Classes

Flat(half_bandwidth)	Hilbert transform of a flat density of states with cutoff.
Fourier(G, *args, **kw)	Lazy Fourier transform between conjugate meshes.
LegendreToMatsubara(G)	Lazy Legendre → Matsubara basis transform.
MatsubaraToLegendre(G)	Lazy Matsubara → Legendre basis transform.
OneFermionInTime([l])	Single-fermion propagator on an imaginary-time mesh.
SemiCircular(half_bandwidth[, chem_potential])	Hilbert transform of a semicircular density of states.
Wilson	alias of Flat