Affiliation: Ivan Franko National University of Lviv

Contribution: Oral

Title: Signal in the redshifted 21 cm Hydrogen Line from Dark Ages as a cosmological test

Abstract: The values of global signal in the redshifted 21 cm hydrogen line from the Dark Ages epoch and the power spectrum of its fluctuation are estimated in the different cosmologies. Especially, it will be illustrated the dependence of the line profile of global signal and amplitude of power spectrum on cosmological parameters of ΛCDM model, the presence of an initial magnetic fields, nature of dark matter particles, and additional heating/cooling mechanisms of baryonic component. It will be also shown that the position and depth of the redshifted 21 cm line from Cosmic Dawn, due to the Wouthuysen-Field effect, is mainly defined by the spectral energy distribution of the first sources of light and their evolution. So, the decameter and meter wavelength observations of the young Universe can significantly supplement the data obtained by the current generation space-based telescopes JWST and EUCLID and ground-based facilities ALMA, VLT, and the SKA-precursors in order to shed the light on the key problems of current cosmology.

This contribution can be found here (pdf).