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  A new scale in the bias expansion

Cabass, G., & Schmidt, F. (2019). A new scale in the bias expansion. Journal of Cosmology and Astroparticle Physics, 2019(5): 031. doi:10.1088/1475-7516/2019/05/031.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-BE79-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-BE7A-F
Genre: Journal Article

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 Creators:
Cabass, Giovanni1, Author              
Schmidt, Fabian1, Author              
Affiliations:
1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: The fact that the spatial nonlocality of galaxy formation is controlled by some short length scale like the Lagrangian radius is the cornerstone of the bias expansion for large-scale-structure tracers. However, the first sources of ionizing radiation between z≈ 15 and z≈ 6 are expected to have significant effects on the formation of galaxies we observe at lower redshift, at least on low-mass galaxies. These radiative-transfer effects introduce a new scale in the clustering of galaxies, i.e. the finite distance which ionizing radiation travels until it reaches a given galaxy. This mean free path can be very large, of order 100 h −1 Mpc. Consequently, higher-derivative terms in the bias expansion could turn out to be non-negligible even on these scales: treating them perturbatively would lead to a massive loss in predictivity and, for example, could spoil the determination of the BAO feature or constraints on the neutrino mass. Here, we investigate under what assumptions an explicit non-perturbative model of radiative-transfer effects can maintain the robustness of large-scale galaxy clustering as a cosmological probe.

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Language(s): eng - English
 Dates: 2019-05-20
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1088/1475-7516/2019/05/031
Other: LOCALID: 3066793
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Title: Journal of Cosmology and Astroparticle Physics
  Abbreviation : J. Cosmol. Astropart. Phys.
  Abbreviation : JCAP
Source Genre: Journal
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Pages: - Volume / Issue: 2019 (5) Sequence Number: 031 Start / End Page: - Identifier: ISSN: 1475-7516