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  Neutrino mass constraints beyond linear order: cosmology dependence and systematic biases

Boyle, A., & Schmidt, F. (2021). Neutrino mass constraints beyond linear order: cosmology dependence and systematic biases. Journal of Cosmology and Astroparticle Physics, 2021(4): 022. doi:10.1088/1475-7516/2021/04/022.

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 Creators:
Boyle, Aoife1, Author              
Schmidt, Fabian2, Author              
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1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              
2High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: We demonstrate the impact on forecasted neutrino mass constraints of improving galaxy clustering and CMB lensing predictions from linear to next-to-leading-order power spectra. The redshift-space 1-loop power spectrum model we adopt requires an additional four free bias parameters, a velocity bias parameter and two new stochastic parameters. These additional nuisance parameters appreciably weaken the constraints on Mν. CMB lensing plays a significant role in helping to alleviate these degeneracies and tighten the final constraints. The constraint on the optical depth to reionisation τ has a strong effect on the constraint on Mν, but only when CMB lensing is included in the analysis to keep the degeneracies with the nuisance parameters under control. We also extract constraints when 1) using the BAO signature only as a distance probe, and 2) isolating the scale-dependence of the power spectrum, which, as shown in previous work, provides a cosmology-independent probe of Mν. All constraints except the latter remain strongly sensitive to the assumption of a flat ΛCDM universe. We perform an analysis of the magnitude of the shift introduced in the inferred Mν value when neglecting nonlinear corrections, and show that, for a Euclid-like survey, this shift becomes roughly equal to the 1σ constraint itself even with a conservative cut-off scale of kmax = 0.1 h Mpc-1. We also perform a calculation of the approximate expected bias in neutrino mass caused by not including the next, 2-loop order and expect a shift of only about 20% of the 1σ error for kmax = 0.2 h Mpc-1 in a Euclid-like survey.

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Language(s): eng - English
 Dates: 2021-04-09
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1475-7516/2021/04/022
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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: 2021 (4) Sequence Number: 022 Start / End Page: - Identifier: ISSN: 1475-7516