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Author  |
Granelli, A.; Klaric, J.; Pasari, D.; Perez-Gonzalez, Y.F.; Turner, J. |
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Title |
ULYSSES the third: An odyssey towards a unified Python toolkit for leptogenesis |
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Journal Article |
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Year |
2027 |
Publication |
Computer Physics Communications |
Abbreviated Journal |
Comput. Phys. Commun. |
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Volume |
330 |
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Pages |
110464 - 25pp |
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Abstract |
We present the third release of ULYSSES, a Python package for the numerical evaluation of the baryon asymmetry generated through leptogenesis. This version includes code implementing state-of-the-art density matrix equations for low-scale leptogenesis with three quasi-degenerate right-handed neutrinos. We extend the validity of the code in this scenario beyond the 100 GeV right-handed neutrino mass scale, into the regime of resonant leptogenesis, by including neutrino production rates valid in both the relativistic and non-relativistic regimes. In addition, in the high-scale vanilla scenario, we provide routines for computing Delta L = 1 scattering processes, enabling full phase-space evolution of the right-handed neutrino and lepton asymmetry. A new--extended parameter interface allows users to pass model-specific inputs beyond the standard leptogenesis runcard without modifying the core infrastructure and demonstrate its use with a toy module that simultaneously solves the vanilla leptogenesis equations and the freeze-in production of dark matter. On top of these improvements, we introduce an alternative parametrisation of the Casas-Ibarra matrix, update the default neutrino oscillation parameters and report cross-checks of the new low-scale leptogenesis module against published benchmarks and independent codes. ULYSSES is publicly available on GitHub https://github.com/earlyuniverse/ulyssesGithub and pip-installable from PyPI. PROGRAM SUMMARY Program title: ULYSSES CPC Library link to program files: https://doi.org/10.17632/4cvdr57t2n.1 Developer's repository link: https://github.com/earlyuniverse/ulysses Licensing provisions: MIT License Programming language: Python 3 Journal reference of previous version: Comput. Phys. Commun. 291 (2023) 108834 Does the new version supersede the previous version?: Yes Reasons for the new version: Extension of the code capabilities to include low-scale leptogenesis scenarios, complete Delta L = 1 scattering processes for high-scale leptogenesis, improved user-defined model support, and enhanced usability through a Python API and Jupyter notebook interface. Summary of revisions: Implementation of a unified treatment of low-scale leptogenesis with three right-handed neutrinos; inclusion of complete Delta L = 1 scattering processes in the leptogenesis evolution equations; addition of alternative Casas-Ibarra parametrisations; support for user-specified initial heavy-neutrino abundances; extension of the framework to accommodate custom leptogenesis models and parameters; introduction of a Python API and Jupyter notebook workflow. Nature of problem: Numerical solution of coupled Boltzmann and Density Matrix equations governing thermal, resonant, and low-scale leptogenesis, including the evaluation of computationally demanding thermal integrals and reaction rates. Solution method: The evolution equations are solved using the odeint and solve_ivp integrators available in Python. Integrals are evaluated using a Numba-accelerated wrapper around the cquadpack integration library. |
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Address |
[Granelli, Alessandro] Univ Valencia, Inst Fis Corpuscular IFIC, CSIC, Parc Cientif UV,C-Catedrat Jose Beltran 2, E-46980 Paterna, Spain, Email: alessandro.granelli@ific.uv.es; |
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Publisher |
Elsevier |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
0010-4655 |
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Notes |
WOS:001916223100001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7507 |
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