Before cosmic reionization, hydrogen atoms acquire a spin polarization quadrupole through interaction with the anisotropic 21-cm radiation field. The of this anisotropies in microwave background (CMB) field gives net orientation to atoms. emitted by these spin-oriented is circularly polarized. Here, we reformulate succinctly derivation expression for circular terms Cartesian (rather than spheri...

Measuring temperature fluctuations in the 21 cm signal from Epoch of Reionization and Cosmic Dawn is one most promising ways to study Universe at high redshifts. Unfortunately, affected by both cosmology astrophysics processes a non-trivial manner. We run suite 1,000 numerical simulations with different values main astrophysical parameters. From these we produce tens thousands maps redshifts $1...