CosmoBit: a GAMBIT module for computing cosmological observables and likelihoods

We introduce $\sf{CosmoBit}$, a module within the open-source $\sf{GAMBIT}$ software framework for exploring connections between cosmology and particle physics with joint global fits. $\sf{CosmoBit}$ provides flexible studying various scenarios beyond $\Lambda$CDM, such as models of inflation, modifications effective number relativistic degrees freedom, exotic energy injection from annihilating or decaying dark matter, variations properties elementary particles neutrino masses lifetime neutron. Many observables likelihoods in are computed via interfaces to $\sf{AlterBBN}$, $\sf{CLASS}$, $\sf{DarkAges}$, $\sf{MontePython}$, $\sf{MultiModeCode}$, $\sf{plc}$. This makes it possible apply wide range constraints large-scale structure, Type Ia supernovae, Big Bang Nucleosynthesis cosmic microwave background. Parameter scans can be performed using many different statistical sampling algorithms available framework, results combined calculations other modules focused on matter. include extensive validation plots first application non-standard freedom temperature, showing that corresponding constraint sum is much weaker than standard scenario.