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Manuscript Title: AlterBBN: A program for calculating the BBN abundances of the elements in alternative cosmologies
Authors: A. Arbey
Program title: AlterBBN
Catalogue identifier: AEMH_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 183(2012)1822
Programming language: C (C99 Standard compliant).
Computer: 32- or 64-bit PC, Mac.
Operating system: Linux, MacOS.
RAM: 100 Mb
Keywords: Big-Bang Nucleosynthesis, Early Universe, Alternative Cosmologies.
PACS: 98.80.Bp, 26.35.+c, 98.80.Ft.
Classification: 1.2, 1.9.

Nature of problem:
Calculation of the abundances of the elements during Big-Bang Nucleosynthesis (BBN).

Solution method:
AlterBBN computes the abundances of the elements by integrating the BBN differential equations thanks to a second-order Runge-Kutta method, obtaining a matrix equation from implicit differencing and solving this equation using Gaussian elimination.

Unusual features:
AlterBBN includes the possibility of altering the underlying cosmological model and testing the influence of the cosmological assumptions on the abundances of the elements. Uncertainties can be evaluated by computing the abundances of the elements using lower or higher limits of the nuclear reaction rates.

Running time:
Compilation: Less than 1 minute. Running: Less than 1 second.