From photometric surveys to HI intensity mapping: Improving constraints on magnification biases while testing gravity

The observed large-scale structure of the Universe is not a direct measure of the underlying distribution of matter. These observations are subtly distorted by gravitational lensing effects, which leave imprints on the statistical distribution of galaxies and offer a powerful test of general relativity. In this work, we investigate whether HI intensity mapping from current and forthcoming surveys can improve constraints on magnification lensing obtained from photometric galaxy surveys. In particular, we investigate whether one can jointly constrain the magnification bias parameters s G(z) and the amplitude of the Weyl potential, which we parametrise as β. We employ a Fisher matrix formalism in order to estimate future constraints on the magnification biases and β. We forecast constraints for three photometric surveys (DES-like, LSST-like, Euclid-like) individually and together with two HI intensity mapping surveys (MeerKLASS, SKAO). We apply the multi-tracer technique by combining each galaxy survey with each HI survey, exploiting the combined constraining in the overlapping sky area. The multi-tracer approach dramatically improves constraints on β by factors of 18 to 50, depending on the surveys considered. For s G(z), improvements can be marginal or by factors of 2 to 4. We also verify that β and s G(z) can be constrained simultaneously as the cross-correlations between tracers break the degeneracies among them. We conclude that the multi-tracer combination of photometric galaxy surveys and HI intensity mapping surveys enables high-precision measurements of both s G(z) and β. This opens an additional pathway to constrain Φ+Ψ and test the validity of general relativity on cosmological scales.