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Blinding multiprobe cosmological experiments

Author(s): Muir, J; Bernstein, GM; Huterer, D; Elsner, F; Krause, E; et al

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Abstract: The goal of blinding is to hide an experiment’s critical results - here the inferred cosmological parameters - until all decisions affecting its analysis have been finalized. This is especially important in the current era of precision cosmology, when the results of any new experiment are closely scrutinized for consistency or tension with previous results. In analyses that combine multiple observational probes, like the combination of galaxy clustering and weak lensing in the Dark Energy Survey (DES), it is challenging to blind the results while retaining the ability to check for (in)consistency between different parts of the data. We propose a simple new blinding transformation, which works by modifying the summary statistics that are input to parameter estimation, such as two-point correlation functions. The transformation shifts the measured statistics to new values that are consistent with (blindly) shifted cosmological parameters while preserving internal (in)consistency. We apply the blinding transformation to simulated data for the projected DES Year 3 galaxy clustering and weak lensing analysis, demonstrating that practical blinding is achieved without significant perturbation of internal-consistency checks, as measured here by degradation of the chi(2) between the data and best-fitting model. Our blinding method’s performance is expected to improve as experiments evolve to higher precision and accuracy.
Publication Date: May-2020
Electronic Publication Date: 15-Apr-2020
Citation: Muir, J, Bernstein, GM, Huterer, D, Elsner, F, Krause, E, Roodman, A, Allam, S, Annis, J, Avila, S, Bechtol, K, Bertin, E, Brooks, D, Buckley-Geer, E, Burke, DL, Rosell, A Carnero, Kind, M Carrasco, Carretero, J, Cawthon, R, Costanzi, M, da Costa, LN, De Vicente, J, Desai, S, Dietrich, JP, Doel, P, Eifler, TF, Everett, S, Fosalba, P, Frieman, J, Garcia-Bellido, J, Gerdes, DW, Gruen, D, Gruendl, RA, Gschwend, J, Hartley, WG, Hollowood, DL, James, DJ, Jarvis, M, Kuehn, K, Kuropatkin, N, Lahav, O, March, M, Marshall, JL, Melchior, P, Menanteau, F, Miquel, R, Ogando, RLC, Palmese, A, Paz-Chinchon, F, Plazas, AA, Romer, AK, Sanchez, E, Scarpine, V, Schubnell, M, Serrano, S, Sevilla-Noarbe, I, Smith, M, Suchyta, E, Tarle, G, Thomas, D, Troxel, MA, Walker, AR, Weller, J, Wester, W, Zuntz, J, Collaboration, DES. (2020). Blinding multiprobe cosmological experiments. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 494 (4454 - 4470. doi:10.1093/mnras/staa965
DOI: doi:10.1093/mnras/staa965
ISSN: 0035-8711
EISSN: 1365-2966
Pages: 4454 - 4470
Type of Material: Journal Article
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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