CERN-TH-2018-146 AlterBBN v 2 : A public code for calculating BigBang nucleosynthesis constraints in alternative cosmologies

We present the version 2 of AlterBBN, an open public code for the calculation of the abundance of the elements from Big-Bang nucleosynthesis. It does not rely on any closed external library or program, aims at being user-friendly and allowing easy modifications, and provides a fast and reliable calculation of the Big-Bang nucleosynthesis constraints in the standard and alternative cosmologies. 1alexandre.arbey@ens-lyon.fr 2Also Institut Universitaire de France, 103 boulevard Saint-Michel, 75005 Paris, France 3jeremy.auffinger@ens-lyon.fr 4kevinh@caltech.edu 5EspenJenssen@hotmail.com 1 ar X iv :1 80 6. 11 09 5v 2 [ as tr oph .C O ] 1 7 A pr 2 01 9