Ultralarge-scale approximations and galaxy clustering: Debiasing constraints on cosmological parameters
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
Upcoming galaxy surveys will allow us to probe the growth of the cosmic large-scale structure with improved sensitivity
compared to current missions, and will also map larger areas of the sky. This means that in addition to the increased precision
in observations, future surveys will also access the ultralarge-scale regime, where commonly neglected effects such as lensing,
redshift-space distortions, and relativistic corrections become important for calculating correlation functions of galaxy positions.
At the same time, several approximations usually made in these calculations such as the Limber approximation break down at
those scales. The need to abandon these approximations and simplifying assumptions at large scales creates severe issues for
parameter estimation methods. On the one hand, exact calculations of theoretical angular power spectra become computationally
expensive, and the need to perform them thousands of times to reconstruct posterior probability distributions for cosmological
parameters makes the approach unfeasible.
Description
Keywords
Astronomy, Astrophysics, Cosmology, Galaxies formation
Citation
Martinelli, M. et al. (2022). Ultralarge-scale approximations and galaxy clustering: Debiasing constraints on cosmological parameters. Monthly Notices of the Royal Astronomical Society, 510(2), 1964–1977. https://doi.org/10.1093/mnras/stab3578