BBN-simple: How to Bake a Universe-Sized Cake
Abstract
Big Bang Nucleosynthesis (BBN), the process of creation of lightest elements in the early universe, is a highly robust, precise, and ultimately successful theory that forms one of the three pillars of the standard hot-Big-Bang cosmological model. Existing theoretical treatments of BBN and the associated computer codes are accurate and flexible, but are typically highly technical and opaque, and not suitable for pedagogical understanding of the BBN. Here we present BBN-simple -- a from-scratch numerical calculation of the lightest element abundances pitched at an advanced undergraduate or beginning graduate level. We review the physics of the early universe relevant for BBN, provide information about the reaction rates, and discuss computational-mathematics background that is essential in setting up a BBN calculation. We calculate the abundances of the principal nuclear species in a standard cosmological model, and find a reasonably good agreement with public precision-level BBN codes.
Keywords
Cite
@article{arxiv.2412.07893,
title = {BBN-simple: How to Bake a Universe-Sized Cake},
author = {Aidan Meador-Woodruff and Dragan Huterer},
journal= {arXiv preprint arXiv:2412.07893},
year = {2024}
}
Comments
16 pages, 6 figures, the associated code may be found at https://websites.umich.edu/~aidanmw/bbn-simple.html