Cosmology from SKA Observatory precursors

We are currently living a fruitful era of cosmology from wide field optical cosmological surveys. By analyzing the clustering of matter, we can use the growth of structure to understand dark energy or to test different models of gravity. However, we will soon enter the multi-tracer and multiwavelength astrophysics era. Radio Continuum Cosmology Clustering surveys will map the matter distribution using Active Galactic Nuclei (AGN) and star forming galaxies (SFG) over a large area and up to high redshifts, and will be crucial to discriminate between current theoretical models. At the same time, we plan to use 21cm intensity mapping as a cosmological probe with surveys such as Tianlai or CHIME and SKAO in the future. In my talk, I will address some of the cosmological prospects of using the Australian Square Kilometer Array Pathfinder (ASKAP) with the Evolutionary Map of the Universe survey (EMU), especially considering the EMU pilot survey and the first cosmological results using data from the Rapid ASKAP Continuum Survey. I will finally address the intrinsic limits of radio continuum cosmology clustering surveys regarding the number density of the different types of galaxies, the limits on the possibility of dividing the sample in several redshift bins and most importantly, how the intrinsic size of galaxies and the limiting technology will reach a hard flux limit of 100 nJy.