Scientific Seminars

Cosmology with a massive multi-tracer survey of large-scale structure

Luis Raul Abramo
Universidade de Sao Paulo

2016-05-10    14:00    Merate - POE

The J-PAS survey will map the 3D structure of the cosmic web to unprecedented depth, completeness and redshift accuracy. It will determine, over 1/5 of the observable sky, the positions of hundreds of millions of galaxies up to z=1.2, and of millions of quasars up to at least z=4. Besides the greatly improved constraints on the nature of dark energy (with a Figure of Merit in the hundreds), J-PAS will study the large-scale structures in the regime of very high-completeness, when dark matter halos are traced by large numbers of galaxies of different types. J-PAS will be the first survey to take full advantage of the different clustering strengths associated with different tracers of large-scale structure, enhancing our understanding of the halo occupation distribution of galaxies, their bias, as well as redshift-space distortions and primordial non-Gaussianities. In order to take advantage of this new feature of forthcoming surveys, we have developed the generalization of the Feldman-Kaiser-Peacock weighting scheme, obtaining the optimal estimators that should be used in the Fourier analysis of the next generation of galaxy surveys. Finally, I will illustrate how multi-tracer surveys can impose vastly improved constraints on parameters such as $f_{NL}$, as well as on modified gravity theories.