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- W4385564862 abstract "ABSTRACT Constraints on the linear growth rate, fσ8, using small-scale redshift space distortion measurements have a significant statistical advantage over those made on large scales. However, these measurements need to carefully disentangle the linear and non-linear information when interpreting redshift space distortions in terms of fσ8. It is particularly important to do this given that some previous measurements found a significant deviation from the expectation based on the Lambda cold dark matter (ΛCDM) model constrained by Planck cosmic microwave background data. We construct a new emulator-based model for small-scale galaxy clustering with scaling parameters for both the linear and non-linear velocities of galaxies, allowing us to isolate the linear growth rate. We train the emulator using simulations from the AbacusCosmos suite, and apply it to data from the extended Baryon Oscillation Spectroscopic Survey luminous red galaxy sample. We obtain a value of fσ8(z = 0.737) = 0.368 ± 0.041, in 2.3σ tension with the Planck 2018 ΛCDM expectation, and find less dependence on the minimum measurement scale than previous analyses." @default.
- W4385564862 created "2023-08-05" @default.
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- W4385564862 date "2023-08-04" @default.
- W4385564862 modified "2023-10-16" @default.
- W4385564862 title "Isolating the linear signal when making redshift space distortion measurements" @default.
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- W4385564862 doi "https://doi.org/10.1093/mnras/stad2351" @default.
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