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  Cosmology inference from a biased density field using the EFT-based likelihood

Elsner, F., Schmidt, F., Jasche, J., Lavaux, G., & Nguyen, N. M. (2020). Cosmology inference from a biased density field using the EFT-based likelihood. Journal of Cosmology and Astroparticle Physics, 2020(1): 029. doi:10.1088/1475-7516/2020/01/029.

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Elsner, Franz1, Author           
Schmidt, Fabian2, Author           
Jasche, Jens, Author
Lavaux, Guilhem, Author
Nguyen, Nhat Minh3, Author           
Affiliations:
1Cosmology, MPI for Astrophysics, Max Planck Society, ou_159876              
2High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              
3Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: The effective-field-theory (EFT) approach to the clustering of galaxies and other biased tracers allows for an isolation of the cosmological information that is protected by symmetries, in particular the equivalence principle, and thus is robust to the complicated dynamics of dark matter, gas, and stars on small scales. All existing implementations proceed by making predictions for the lowest-order n-point functions of biased tracers, as well as their covariance, and comparing with measurements. Recently, we presented an EFT-based expression for the conditional probability of the density field of a biased tracer given the matter density field, which in principle uses information from arbitrarily high order n-point functions. Here, we report results based on this likelihood by applying it to halo catalogs in real space, specifically an inference of the power spectrum normalization σ8. We include bias terms up to second order as well as the leading higher-derivative term. For a cutoff value of Λ = 0.1 hMpc−1, we recover the ground-truth value of σ8 to within 95% CL for different halo samples and redshifts. We discuss possible sources for the remaining systematic bias in σ8 as well as future developments.

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Language(s): eng - English
 Dates: 2020-01-10
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1475-7516/2020/01/029
Other: LOCALID: 3238142
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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: 2020 (1) Sequence Number: 029 Start / End Page: - Identifier: ISSN: 1475-7516