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- W4385301426 abstract "ABSTRACT One important source of systematics in galaxy redshift surveys comes from the estimation of the galaxy window function. Up until now, the impact of the uncertainty in estimating the galaxy window function on parameter inference has not been properly studied. In this paper, we show that the uncertainty and the bias in estimating the galaxy window function will be salient for ongoing and next-generation galaxy surveys using a simulation-based approach. With a specific case study of cross-correlating emission-line galaxies from the DESI Legacy Imaging Surveys and the Planck cosmic microwave background lensing map, we show that neural network-based regression approaches to modelling the window function are superior in comparison to linear regression-based models. We additionally show that the definition of the galaxy overdensity estimator can impact the overall signal-to-noise of observed power spectra. Finally, we show that the additive biases coming from the window functions can significantly bias the modes of the inferred parameters and also degrade their precision. Thus, a careful understanding of the window functions will be essential to conduct cosmological experiments." @default.
- W4385301426 created "2023-07-28" @default.
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- W4385301426 date "2023-07-26" @default.
- W4385301426 modified "2023-10-16" @default.
- W4385301426 title "On the impact of the galaxy window function on cosmological parameter estimation" @default.
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- W4385301426 doi "https://doi.org/10.1093/mnras/stad2210" @default.
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