ULYSSES: Universal leptogenesis equation solver

Abstract ULYSSES is a python package that calculates the baryon asymmetry produced from leptogenesis in the context of a type-I seesaw mechanism. The code solves the semi-classical Boltzmann equations for points in the model parameter space as specified by the user. We provide a selection of predefined Boltzmann equations as well as a plugin mechanism for externally provided models of leptogenesis. Furthermore, the ULYSSES code provides tools for multi-dimensional parameter space exploration. The emphasis of the code is on user flexibility and rapid evaluation. It is publicly available at https://github.com/earlyuniverse/ulysses . Program summary Program Title: ULYSSES CPC Library link to program files: http://dx.doi.org/10.17632/rzd24f34h2.1 Developer’s repository link: github.com/earlyuniverse/ulysses Licensing provisions: MIT Programming language: python3 Nature of problem: Solving semi-classical momentum averaged Boltzmann equations for leptogenesis in the context of a type-I seesaw mechanism. Solution method: Numerically solving coupled differential equations that can be complex.