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• W3119653973 abstract "We present validation tests of emulator-based halo model method for cosmological parameter inference, assuming hypothetical measurements of the projected correlation function of galaxies, ${w}_{mathrm{p}}(R)$, and the galaxy-galaxy weak lensing, $mathrm{ensuremath{Delta}}mathrm{ensuremath{Sigma}}(R)$, from the spectroscopic SDSS galaxies and the Hyper Suprime-Cam Year 1 (HSC-Y1) galaxies. To do this, we use dark emulator developed in Nishimichi et al. based on an ensemble of $N$-body simulations, which is an emulation package enabling a fast, accurate computation of halo clustering quantities (halo mass function, halo autocorrelation and halo-matter cross-correlation) for flat-geometry cold dark matter cosmologies. Adopting the halo occupation distribution, the emulator allows us to obtain model predictions of $mathrm{ensuremath{Delta}}mathrm{ensuremath{Sigma}}$ and ${w}_{mathrm{p}}$ for the SDSS-like galaxies at a few CPU seconds for an input set of parameters. We present performance and validation of the method by carrying out Markov chain Monte Carlo analyses of the mock signals measured from a variety of mock catalogs that mimic the SDSS and HSC-Y1 galaxies. We show that the halo model method can recover the underlying true cosmological parameters to within the 68% credible interval, except for the mocks including the assembly bias effect (although we consider the unrealistically large amplitude of assembly bias effect). Even for the assembly bias mock, we demonstrate that the cosmological parameters can be recovered if the analysis is restricted to scales $Rensuremath{gtrsim}10text{ }text{ }{h}^{ensuremath{-}1}text{ }mathrm{Mpc}$ (i.e., if the information on the average mass of halos hosting SDSS galaxies inherent in the 1-halo term of $mathrm{ensuremath{Delta}}mathrm{ensuremath{Sigma}}$ is not included). We also show that, by using a single population of source galaxies to infer the relative strengths of $mathrm{ensuremath{Delta}}mathrm{ensuremath{Sigma}}$ for multiple lens samples at different redshifts, the joint probes method allows for self-calibration of photometric redshift errors and multiplicative shear bias. Thus we conclude that the emulator-based halo model method can be safely applied to the HSC-Y1 dataset, achieving a precision of $ensuremath{sigma}({S}_{8})ensuremath{simeq}0.04$ after marginalization over nuisance parameters such as the galaxy-halo connection parameters and the photo-$z$ error parameter, and our method is complementary to methods based on perturbation theory." @default.
• W3119653973 created "2021-01-18" @default.
• W3119653973 creator A5027646412 @default.
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• W3119653973 date "2022-10-21" @default.
• W3119653973 modified "2023-10-15" @default.
• W3119653973 title "Cosmological inference from an emulator based halo model. I. Validation tests with HSC and SDSS mock catalogs" @default.
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