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• W4366609854 abstract "Reliable analytical modeling of the non-linear power spectrum (PS) of matter perturbations is among the chief pre-requisites for cosmological analyses from the largest sky surveys. This is especially true for the models that extend the standard general-relativity paradigm by adding the fifth force, where numerical simulations can be prohibitively expensive. Here we present a method for building accurate PS models for two modified gravity (MG) variants: namely the Hu-Sawicki $f(R)$, and the normal branch of the Dvali-Gabadadze-Porrati (nDGP) braneworld. We start by modifying the standard halo model (HM) with respect to the baseline Lambda-Cold-Dark-Matter ($Lambda$CDM) scenario, by using the HM components with specific MG extensions. We find that our $P(k)_{text{HM}}$ retains 5% accuracy only up to mildly non-linear scales ($k lesssim 0.3$ $h/,mbox{Mpc}$) when compared to PS from numerical simulations. At the same time, our HM prescription much more accurately captures the ratio $Upsilon(k) = P(k)_{text{MG}}/P(k)_{Lambda text{CDM}}$ up to non-linear scales. We show that using HM-derived $Upsilon(k)$ together with a viable non-linear $Lambda$CDM $P(k)$ prescription (such as HALOFIT), we render a much better and more accurate PS predictions in MG. The new approach yields considerably improved performance, with modeled $P(k)_{text{MG}}$ being now accurate to within 5% all the way to non-linear scales of $k lesssim 2.5-3$ $h/,mbox{Mpc}$. The magnitude of deviations from GR as fostered by these MG models is typically $mathcal{O}(10%)$ in these regimes. Therefore reaching 5% PS modeling is enough for forecasting constraints on modern-era cosmological observables." @default.
• W4366609854 created "2023-04-23" @default.
• W4366609854 creator A5029121397 @default.
• W4366609854 creator A5052822241 @default.
• W4366609854 creator A5087908428 @default.
• W4366609854 date "2023-04-21" @default.
• W4366609854 modified "2023-10-16" @default.
• W4366609854 title "Improved analytical modeling of the nonlinear power spectrum in modified gravity cosmologies" @default.
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