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  Compensated isocurvature perturbations in the galaxy power spectrum

Barreira, A., Cabass, G., Lozanov, K. D., & Schmidt, F. (2020). Compensated isocurvature perturbations in the galaxy power spectrum. Journal of Cosmology and Astroparticle Physics, 2020(7): 049. doi:10.1088/1475-7516/2020/07/049.

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 Creators:
Barreira, Alexandre1, Author              
Cabass, Giovanni1, Author              
Lozanov, Kaloian D.1, Author              
Schmidt, Fabian1, Author              
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1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: We investigate the potential of the galaxy power spectrum to constrain compensated isocurvature perturbations (CIPs), primordial fluctuations in the baryon density that are compensated by fluctuations in CDM density to ensure an unperturbed total matter density. We show that CIPs contribute to the galaxy overdensity at linear order, and if they are close to scale-invariant, their effects are nearly perfectly degenerate with the local PNG parameter fNL if they correlate with the adiabatic perturbations. This degeneracy can however be broken by analyzing multiple galaxy samples with different bias parameters, or by taking CMB priors on fNL into account. Parametrizing the amplitude of the CIP power spectrum as Pσσ = A2PRR(where PRR is the adiabatic power spectrum) we find, for a number of fiducial galaxy samples in a simplified forecast setup, that constraints on A, relative to those on fNL, of order σAfNL ≈ 1−2 are achievable for CIPs correlated with adiabatic perturbations, and σAfNL ≈ 5 for the uncorrelated case. These values are independent of survey volume, and suggest that current galaxy data are already able to improve significantly on the tightest existing constraints on CIPs from the CMB. Future galaxy surveys that aim to achieve σfNL ~ 1 have the potential to place even stronger bounds on CIPs.

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Language(s): eng - English
 Dates: 2020-07-23
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1475-7516/2020/07/049
Other: LOCALID: 3256558
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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 (7) Sequence Number: 049 Start / End Page: - Identifier: ISSN: 1475-7516