PRyMordial: The First Three Minutes, Within and Beyond the Standard Model

TL;DR

PRyMordial is a Python package that enables fast and precise calculations of early universe observables, particularly Big Bang Nucleosynthesis, including effects beyond the Standard Model, facilitating advanced cosmological research.

Contribution

It introduces PRyMordial, the first efficient computational tool for BBN observables that incorporates non-instantaneous decoupling effects and supports beyond Standard Model physics.

Findings

Accurate computation of light-element abundances in BBN.

Inclusion of non-instantaneous decoupling effects.

Compatibility with Standard Model and New Physics scenarios.

Abstract

In this work we present PRyMordial: A package dedicated to efficient computations of observables in the Early Universe with the focus on the cosmological era of Big Bang Nucleosynthesis (BBN). The code offers fast and precise evaluation of BBN light-element abundances together with the effective number of relativistic degrees of freedom, including non-instantaneous decoupling effects. PRyMordial is suitable for state-of-the-art analyses in the Standard Model as well as for general investigations into New Physics active during BBN. After reviewing the physics implemented in PRyMordial, we provide a short guide on how to use the code for applications in the Standard Model and beyond. The package is written in Python, but more advanced users can optionally take advantage of the open-source community for Julia. PRyMordial is publicly available on GitHub.