Improvements in cosmological constraints from breaking growth degeneracy

0540714 - FZÚ 2021 RIV FR eng J - Journal Article
Perenon, L. - Ilić, Stephane - Maartens, R. - de la Cruz-Dombriz, A.
Improvements in cosmological constraints from breaking growth degeneracy.
Astronomy & Astrophysics. Roč. 642, Oct (2020), s. 1-8, č. článku A116. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA MŠMT EF15_003/0000437
Grant - others:OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institutional support: RVO:68378271
Keywords : galaxies * dark energy * large-scale structure of Universe
OECD category: Nuclear physics
Impact factor: 5.803, year: 2020
Method of publishing: Limited access
https://doi.org/10.1051/0004-6361/202038409

Context. The key probes of the growth of a large-scale structure are its rate f and amplitude σ8. Redshift space distortions in the galaxy power spectrum allow us to measure only the combination fσ8, which can be used to constrain the standard cosmological model or alternatives. By using measurements of the galaxy-galaxy lensing cross-correlation spectrum or of the galaxy bispectrum, it is possible to break the fσ8 degeneracy and obtain separate estimates of f and σ8 from the same galaxy sample. Currently there are very few such separate measurements, but even this allows for improved constraints on cosmological models.Aims. We explore how having a larger and more precise sample of such measurements in the future could constrain further cosmological models.Methods.
Permanent Link: http://hdl.handle.net/11104/0318330