ULYSSES, universal LeptogeneSiS equation solver: Version 2

doi:10.1016/j.cpc.2023.108834

2023-10-01

Alessandro Granelli

Christopher R. Leslie

Yuber F. Perez-Gonzalez

DOI：10.1016/j.cpc.2023.108834

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摘要

En 中文

ULYSSES is a Python package that calculates the baryon asymmetry produced from leptogenesis in the context of a type-I seesaw mechanism. In this release, the new features include code which solves the Boltzmann equations for low-scale leptogenesis; the complete Boltzmann equations for thermal leptogenesis applying proper quantum statistics without assuming kinetic equilibrium of the righthanded neutrinos; and, primordial black hole-induced leptogenesis. ULYSSES version 2 has the added functionality of a pre-provided script for a two-dimensional grid scan of the parameter space. As before, the emphasis of the code is on user flexibility, rapid evaluation and is publicly available at https:// github .com /earlyuniverse /ulysses.Program summary Program Title: ULYSSES CPC Library link to program files: https://doi .org /10 .17632 /rzd24f34h2 .2 Developer's repository link: https://github .com /earlyuniverse /ulysses /tree /master /ulysses Licensing provisions: MIT Programming language: Python3 Journal reference of previous version: Comput. Phys. Commun. 262 (2021) 107813 Does the new version supersede the previous version?: Yes Reasons for the new version: Inclusion of additional effects in Boltzmann equations. Summary of revisions: Low scale leptogenesis, PBH-induced leptogenesis, and complete leptogenesis equations (non-momentum integrated equations) are provided. Nature of problem: Solve the Boltzmann equations for thermal, resonant and low-scale leptogenesis through a set of coupled ordinary differential equations. Solution method: Boltzmann equations are solved using a combination of odeint and solve_ivp in Python3.& COPY; 2023 Published by Elsevier B.V.

Keyword:

Leptogenesis

Type-I seesaw mechanism

Boltzmann equation

Neutrinos