Corentin Cadiou
Postdoc
Probing cosmology via the clustering of critical points
Author
Summary, in English
Exclusion zones in the cross-correlations between critical points (peak-void, peak-wall, filament-wall, and filament-void) of the density field define quasi-standard rulers that can be used to constrain dark matter and dark energy cosmological parameters. The average size of the exclusion zone is found to scale linearly with the typical distance between extrema. The latter changes as a function of the matter content of the universe in a predictable manner, but its comoving size remains essentially constant in the linear regime of structure growth on large scales, unless the incorrect cosmology is assumed in the redshift–distance relation. This can be used to constrain the dark energy parameters when considering a survey that scans a range of redshifts. The precision of the parameter estimation is assessed using a set of cosmological simulations, and is found to be a 4σ detection of a change in matter content of 5 per cent, or about 3.8σ detection of 50 per cent shift in the dark energy parameter using a full sky survey up to redshift 0.5.
Department/s
- Astrophysics
Publishing year
2024-02
Language
English
Pages
1604-1614
Publication/Series
Monthly Notices of the Royal Astronomical Society
Volume
528
Issue
2
Document type
Journal article
Publisher
Oxford University Press
Topic
- Astronomy, Astrophysics and Cosmology
Keywords
- large-scale structure of Universe
- methods: analytical
- methods: data analysis
- methods: statistical
Status
Published
ISBN/ISSN/Other
- ISSN: 0035-8711