Astrolunch: Anaelle Hallé (Observatoire de Paris)

Tue, 21/07/2020 - 12:30 to 13:30

Power spectrum response of large-scale structure
We present work on the characterisation of cosmological structure growth using the power spectrum response function of the large-scale structure of the Universe introduced in Nishimich et al 2016. This response function describes how the evolved power spectrum is modified by a small change in initial power through non-linear mode coupling of gravitational evolution. It can be used to study the limits of perturbation theories by comparison to numerical simulations. We will present the recent results of Halle et al 2020 on approaches improving the agreement between theoretical approximations and numerical simulations, in both one dimension and three dimensions.