Hybrid P` (k): General, unified, non-linear matter power spectrum in redshift space
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing Ltd
Abstract
Constraints on gravity and cosmology will greatly benefit from performing joint
clustering and weak lensing analyses on large-scale structure data sets. Utilising non-linear
information coming from small physical scales can greatly enhance these constraints. At the
heart of these analyses is the matter power spectrum. Here we employ a simple method,
dubbed “Hybrid P`(k)”, based on the Gaussian Streaming Model (GSM), to calculate the
quasi non-linear redshift space matter power spectrum multipoles. This employs a fully nonlinear and theoretically general prescription for the matter power spectrum. We test this
approach against comoving Lagrangian acceleration simulation measurements performed in
GR, DGP and f(R) gravity and find that our method performs comparably or better to the
dark matter TNS redshift space power spectrum model for dark matter. When comparing
the redshift space multipoles for halos, we find that the Gaussian approximation of the GSM
with a linear bias and a free stochastic term, N, is competitive to the TNS model. Our
approach offers many avenues for improvement in accuracy as well as further unification
under the halo model.
Description
Keywords
Gravitational lensing, Power spectrum, Redshift surveys, Modified gravity, Hybrid P` (k)
Citation
Pourtsidou, A. et al. (2020). Hybrid P` (k): General, unified, non-linear matter power spectrum in redshift space. Journal of Cosmology and Astroparticle Physics, 2020(09)