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- W3200517263 abstract "Perturbation theory (PT) has been used to interpret the observed nonlinear large-scale structure statistics at the quasi-linear regime. To facilitate the PT-based analysis, we have presented the GridSPT algorithm, a grid-based method to compute the nonlinear density and velocity fields in standard perturbation theory (SPT) from a given linear power spectrum. Here, we further put forward the approach by taking the redshift-space distortions into account. With the new implementation, we have, for the first time, generated the redshift-space density field to the fifth order and computed the next-to-next-to-leading order (2 loop) power spectrum and the next-to-leading order (1 loop) bispectrum of matter clustering in redshift space. By comparing the result with corresponding analytical SPT calculation and $N$-body simulations, we find that the SPT calculation (A) suffers much more from the UV sensitivity due to the higher-derivative operators and (B) deviates from the $N$-body results from the Fourier wavenumber smaller than real space $k_{rm max}$. Finally, we have shown that while Pad'e approximation removes spurious features in morphology, it does not improve the modeling of power spectrum and bispectrum." @default.
- W3200517263 created "2021-09-27" @default.
- W3200517263 creator A5002865396 @default.
- W3200517263 creator A5013821884 @default.
- W3200517263 creator A5088495709 @default.
- W3200517263 date "2022-05-06" @default.
- W3200517263 modified "2023-10-15" @default.
- W3200517263 title "Grid-based calculations of redshift-space matter fluctuations from perturbation theory: UV sensitivity and convergence at the field level" @default.
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