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  General relativistic effects in the galaxy bias at second order

Umeh, O., Koyama, K., Maartens, R., Schmidt, F., & Clarkson, C. (2019). General relativistic effects in the galaxy bias at second order. Journal of Cosmology and Astroparticle Physics, 2019(5): 020. doi:10.1088/1475-7516/2019/05/020.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-B551-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-B552-4
Genre: Journal Article

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Umeh, Obinna, Author
Koyama, Kazuya, Author
Maartens, Roy, Author
Schmidt, Fabian1, Author              
Clarkson, Chris, Author
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1High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: The local galaxy bias formalism relies on the energy constraint equation at the formation time to relate the metric perturbation to the matter density contrast. In the Newtonian approximation, this relationship is linear, which allows us to specify the initial galaxy density as a function of local physical operators. In general relativity however, the relationship is intrinsically nonlinear and a modulation of the short-wavelength mode by the long-wavelength mode might be expected. We describe in detail how to obtain local coordinates where the coupling of the long- to the short-wavelength modes is removed through a change of coordinates (in the absence of primordial non-Gaussianity). We derive the general-relativistic correction to the galaxy bias expansion at second order. The correction does not come from the modulation of small-scale clustering by the long-wavelength mode; instead, it arises from distortions of the volume element by the long-wavelength mode and it does not lead to new bias parameters.

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Language(s): eng - English
 Dates: 2019-05-13
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1088/1475-7516/2019/05/020
Other: LOCALID: 3064951
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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: 020 Start / End Page: - Identifier: ISSN: 1475-7516