ctseg
The facts below are what the maker publishes about ctseg, checked and dated. Our editors have not written about it yet.
Plans and prices
From ctseg's own pricing page, checked 11 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| CTSEG | Free | Free software; requires TRIQS; perpendicular spin-spin expansion is supported only for a single orbital |
The facts
Each one read from ctseg's own pages, with the date it was checked.
What it does
- Algorithm
- The double expansion samples powers of the hybridization function and perpendicular spin-spin interaction to measure observables such as the Green’s function.checked 11 Oct 2026
- Authors
- The TRIQS/ctseg solver was written by N. Kavokine and O. Parcollet, with contributions from H. Lu and N. Wentzell.checked 11 Oct 2026
- Delivery mode
- desktopchecked 24 Sep 2026
- Dependency
- Building CTSEG from source requires the TRIQS library, and CTSEG must match TRIQS in its major and minor version numbers.checked 11 Oct 2026
- Installation
- The project documents Ubuntu 24.04 Debian packages, Linux and OSX Anaconda packages, Docker, and building from source.checked 11 Oct 2026
- Interactions
- It supports possibly retarded density-density and spin-spin interactions on the impurity.checked 11 Oct 2026
- License
- TRIQS, the software ecosystem CTSEG is based on, is free software distributed under the GPL license.checked 11 Oct 2026
- Measurement constraint
- With perpendicular spin-spin interactions, the improved self-energy estimator is available only when the spin-spin interactions are rotationally invariant.checked 11 Oct 2026
- Measurements
- Documented observables include imaginary-time Green’s functions, self-energy estimators, densities, density correlations, two-particle Green’s functions, state histograms, and perturbation-order histograms.checked 11 Oct 2026
- Offline access
- Yeschecked 24 Sep 2026
- Orbital limit
- The perpendicular spin-spin expansion is supported only for a single orbital; for multiple orbitals, only expansion in the hybridization function is possible.checked 11 Oct 2026
- Performance
- Under its supported interaction restrictions, CTSEG provides better performance than the generic CTHYB solver.checked 11 Oct 2026
- Purpose
- CTSEG is a TRIQS-based hybridization-expansion segment-picture solver for quantum impurities coupled to an external bath.checked 11 Oct 2026
- Reproducibility
- The installation guide recommends stable releases of TRIQS and its applications for reproducible scientific calculations.checked 11 Oct 2026
- Support
- The TRIQS project points users to GitHub Discussions and GitHub issues for help with problems.checked 11 Oct 2026
Money
- Free plan
- Yeschecked 24 Sep 2026
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