Published January 14, 2026
| Version 1.0.0
Software
Open
Nambu–Jona-Lasinio Equation of State Module
Authors/Creators
-
1.
Technische Universität Darmstadt
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2.
University of Illinois Urbana-Champaign
Description
This module provides code to calculate an equation of state for dense, color-superconducting quark matter. Specifically, it implements a renormalization-group–consistent three-flavor Nambu–Jona-Lasinio (NJL) model in the (Hartree) mean-field approximation, allowing for condensation in the scalar-isoscalar channel, a repulsive vector-isoscalar channel, and the color-antitriplet flavor-antitriplet diquark pairing channel. It also includes a six-quark Kobayashi–Maskawa–’t Hooft type interaction to model :math:`U_A(1)` breaking.
The NJL model is non-renormalizable and must be regularized. This module allows the user to choose between a conventional cutoff regularization and a renormalization-group–consistent regularization. In the language of the functional renormalization group, it states that the effective potential in the infrared must not depend on the initial UV scale. The renormalization-group-consistent version of the NJL model allows one to avoid cutoff artifacts of the conventional regularization. This is of particular importance for the study of color-superconducting quark matter at neutron-star densities, as cutoff artifacts lead to unphysical suppression of the diquark condensates, which affects the phase structure at nonzero temperatures.
For more information about the NJL module, see the full MUSES documentation or files in the directory docs/src/
The module is tested and implemented in the MUSES Calculation Engine.
MUSES project website: https://musesframwork.io/
Files
njl-MUSES.zip
Additional details
Related works
- Is described by
- Publication: arXiv:2408.06704 (arXiv)
- Is supplement to
- Publication: arXiv:2411.04064 (arXiv)
Software
- Repository URL
- https://gitlab.com/nsf-muses/njl
- Programming language
- C++ , Python , Dockerfile
- Development Status
- Active