Beyond reionization epoch cosmic hydrogen is neutral and can be directly observed through its 21 cm line signal. If dark matter (DM) decays or annihilates the corresponding energy input affects the hydrogen kinetic temperature and ionized fraction, and contributes to the Lyα background. The changes induced by these processes on the 21 cm signal can then be used to constrain the proposed DM cand...

We study the limits of accuracy for weak lensing maps of dark matter using diffuse 21-cm radiation from the pre-reionization epoch using simulations. We improve on previous “optimal” quadratic lensing estimators by using shear and convergence instead of deflection angles. We find that non-Gaussianity provides a limit to the accuracy of weak lensing reconstruction, even if instrumental noise is ...

We model the 21cm power spectrum across Cosmic Dawn and Epoch of Reionization (EoR) in fuzzy dark matter (FDM) cosmologies. The suppression small mass halos FDM models leads to a delay onset redshift these epochs relative cold (CDM) scenarios. This strongly impacts its evolution. at given stage EoR/Cosmic process is also modified: general, amplitude fluctuations boosted by enhanced bias factor ...

ABSTRACT The success of H i intensity mapping is largely dependent on how well 21-cm foreground contamination can be controlled. In order to progress our understanding further, we present a range simulated data from two different ∼3000 deg2 sky regions, with varying effects polarization leakage. Combining these cosmological simulations creates test cases that require treatments. This allows us ...