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- W4385714510 abstract "Abstract Widefield surveys probe clustered scalar fields — such as galaxy counts, lensing potential, etc. — that are sensitive to different cosmological and astrophysical processes. Constraining such processes depends on the statistics that summarize the field. We explore the cumulative distribution function (CDF) as a summary of the galaxy lensing convergence field. Using a suite of N-body lightcone simulations, we show the CDFs’ constraining power is modestly better than the 2nd and 3rd moments, as CDFs approximately capture information from all moments. We study the practical aspects of applying CDFs to data, using the Dark Energy Survey (DES Y3) data as an example, and compute the impact of different systematics on the CDFs. The contributions from the point spread function and reduced shear approximation are $lesssim 1%$ of the total signal. Source clustering effects and baryon imprints contribute 1-10%. Enforcing scale cuts to limit systematics-driven biases in parameter constraints degrades these constraints a noticeable amount, and this degradation is similar for the CDFs and the moments. We detect correlations between the observed convergence field and the shape noise field at 13σ. The non-Gaussian correlations in the noise field must be modeled accurately to use the CDFs, or other statistics sensitive to all moments, as a rigorous cosmology tool." @default.
- W4385714510 created "2023-08-10" @default.
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