The cruciality of non-linear scales for future galaxy surveys
I will discuss the cosmological information content of large scale structure depending on spatial scale. I will challenge the community's unconscious lore, by showing that information disappointingly plateaus in the quasi-linear regime, but strikingly rises again in the strongly non-linear regime. I will carefully explain why this happens, due to the impact of non-linearity both on the observables and on covariances. Finally I will discuss what the strongly non-linear regime can bring, and why combining probes with cluster counts will be crucially synergetic for this.