Speaker
Description
We study the formation of first molecules H$_2$ and HD, negative Hydrogen ions H$^-$, molecular ions H$_2^+$ and HeH$^+$ in the pre-reionization Universe. The cosmological recombination is described within the framework of modified model of the effective 3-level atom [Seager, Sasselov $\&$ Scott, 1999; Wong, Moss $\&$ Scott, 2008], while for the kinetics of chemical reactions we restrict consideration to the minimal model of [Galli $\&$ Palla, 1998] for Hydrogen, Deuterium and Helium. It is found that the uncertainties of molecular abundances caused by the inaccuracies in description of cosmological recombination are about 2-3$\%$, comparable to those caused by the uncertainties of parameters of the $\Lambda$CDM model (up to 2.3$\%$). We investigate the effect of deviations from $\Lambda$CDM (minimally and non-minimally coupled dynamical dark energy, decaying dark matter) on the evolution of abundances of the first molecules.
