The halo model with beyond-linear halo bias: unbiasing cosmological constraints from galaxy-galaxy lensing and clustering

Constance Mahony*, Andrej Dvornik, Alexander Mead, Catherine Heymans, Marika Asgari, Hendrik Hildebrandt, Hironao Miyatake, Takahiro Nishimichi, Robert Reischke

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We determine the error introduced in a joint halo model analysis of galaxy-galaxy lensing and galaxy clustering observables when adopting the standard approximation of linear halo bias. Considering the Kilo-Degree Survey, we forecast that ignoring the non-linear halo bias would result in up to 5σ offsets in the recovered cosmological parameters describing structure growth, S8, and the matter density parameter, Ωm. We include the scales 10−1.3<rp /h−1Mpc<10 in the data vector, and the direction of these offsets are shown to depend on the freedom afforded to the halo model through other nuisance parameters. We conclude that a beyond-linear halo bias correction must therefore be included in future cosmological halo model analyses of large-scale structure observables on non-linear scales.
Original languageEnglish
Pages (from-to)2612-2623
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume515
Issue number2
Early online date6 Jul 2022
DOIs
Publication statusPublished - 1 Sept 2022

Keywords / Materials (for Non-textual outputs)

  • cosmological parameters
  • large-scale structure of Universe
  • methods: analytical

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