Observing relativistic features in large-scale structure surveys - I. Multipoles of the power spectrum
Loading...
Date
2021
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
Planned efforts to probe the largest observable distance scales in future cosmological surveys are motivated by a desire to detect relic correlations left over from inflation and the possibility of constraining novel gravitational phenomena beyond general relativity (GR). On such large scales, the usual Newtonian approaches to modelling summary statistics like the power spectrum and bispectrum are insufficient, and we must consider a fully relativistic and gauge-independent treatment of observables such as galaxy number counts in order to avoid subtle biases, e.g. in the determination of the fNL parameter. In this work, we present an initial application of an analysis pipeline capable of accurately modelling and recovering relativistic spectra and correlation functions. As a proof of concept, we focus on the non-zero dipole of the redshift-space power spectrum that arises in the cross-correlation of different mass bins of dark matter haloes, using strictly gauge-independent observable quantities evaluated on the past light cone of a fully relativistic N-body simulation in a redshift bin 1.7 ≤ z ≤ 2.9.
Description
Keywords
Cosmological parameters, Large-scale structure of Universe, Methods, Numerical, Software
Citation
Bull, P. et al. (2021). Observing relativistic features in large-scale structure surveys - I. Multipoles of the power spectrum. Monthly Notices of the Royal Astronomical Society, 501(2), 2547-2561