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- W4226394941 abstract "In this paper we introduce the `redshift fluctuation' as a gauge-invariant cosmological observable and give its fully relativistic expression at first order in cosmological perturbation theory. We show that this corresponds effectively to number counts with a radial window function with vanishing mean which therefore resolve smaller scale radial modes than standard number counts. In a detailed analysis of the angular power spectrum of this new variable, we study the relevance of different relativistic contributions, and how it differs from the conventional observable galaxy number count fluctuations. In order to investigate its utility for future spectroscopic surveys, we perform Fisher forecasts for a Euclid-like and an SKAII-like configuration, as examples. Particular focus is placed on the dependence of the results on the size of the redshift bins and on the cutoff in $ell$ adopted in the analysis." @default.
- W4226394941 created "2022-05-05" @default.
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- W4226394941 date "2022-03-14" @default.
- W4226394941 modified "2023-09-27" @default.
- W4226394941 title "Redshift weighted galaxy number counts" @default.
- W4226394941 doi "https://doi.org/10.48550/arxiv.2203.07414" @default.
- W4226394941 hasPublicationYear "2022" @default.
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