PUB - Publikationen an der Universität Bielefeld

We present forecasts for constraints on cosmological models which can beobtained by forthcoming radio continuum surveys: the wide surveys with the LOwFrequency ARray (LOFAR), Australian Square Kilometre Array Pathfinder (ASKAP)and the Westerbork Observations of the Deep APERTIF Northern sky (WODAN). Weuse simulated catalogues appropriate to the planned surveys to predictmeasurements obtained with the source auto-correlation, the cross-correlationbetween radio sources and CMB maps (the Integrated Sachs-Wolfe effect), thecross-correlation of radio sources with foreground objects due to cosmicmagnification, and a joint analysis together with the CMB power spectrum andsupernovae. We show that near future radio surveys will bring complementarymeasurements to other experiments, probing different cosmological volumes, andhaving different systematics. Our results show that the unprecedented skycoverage of these surveys combined should provide the most significantmeasurement yet of the Integrated Sachs-Wolfe effect. In addition, we show thatusing the ISW effect will significantly tighten constraints on modified gravityparameters, while the best measurements of dark energy models will come fromgalaxy auto-correlation function analyses. Using the combination of EMU andWODAN to provide a full sky survey, it will be possible to measure the darkenergy parameters with an uncertainty of \{$\sigma (w_0) = 0.05$, $\sigma (w_a)= 0.12$\} and the modified gravity parameters \{$\sigma (\eta_0) = 0.10$,$\sigma (\mu_0) = 0.05$\}, assuming Planck CMB+SN(current data) priors.Finally, we show that radio surveys would detect a primordial non-Gaussianityof $f_{\rm NL}$ = 8 at 1-$\sigma$ and we briefly discuss other promisingprobes.