Dark Energy Survey year 3 results: covariance modelling and its impact on parameter estimation and quality of fit

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Autor(es): dc.contributorUniversity of Cambridge-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorLaboratório Interinstitucional de e-Astronomia - LIneA-
Autor(es): dc.contributorUniversity of Michigan-
Autor(es): dc.contributorFermi National Accelerator Laboratory-
Autor(es): dc.contributorUniversity of Arizona-
Autor(es): dc.contributorCalifornia Institute of Technology-
Autor(es): dc.contributorUniversity of Chicago-
Autor(es): dc.contributorStanford University-
Autor(es): dc.contributorUniversity of Hawaii-
Autor(es): dc.contributorOhio State University-
Autor(es): dc.contributorInstitut d'Estudis Espacials de Catalunya (IEEC)-
Autor(es): dc.contributorCSIC-
Autor(es): dc.contributorSLAC National Accelerator Laboratory-
Autor(es): dc.contributorNational Center for Supercomputing Applications-
Autor(es): dc.contributorMedioambientales y Tecnológicas (CIEMAT)-
Autor(es): dc.contributorUniversity of Portsmouth-
Autor(es): dc.contributorUniversity of Sussex-
Autor(es): dc.contributorPrinceton University-
Autor(es): dc.contributorUniversity of Southampton-
Autor(es): dc.contributorOak Ridge National Laboratory-
Autor(es): dc.contributorMax Planck Institute for Extraterrestrial Physics-
Autor(es): dc.contributorLudwig-Maximilians Universität München-
Autor(es): dc.creatorFriedrich, O.-
Autor(es): dc.creatorAndrade-Oliveira, F.-
Autor(es): dc.creatorCamacho, H.-
Autor(es): dc.creatorAlves, O.-
Autor(es): dc.creatorRosenfeld, R.-
Autor(es): dc.creatorSanchez, J.-
Autor(es): dc.creatorFang, X.-
Autor(es): dc.creatorEifler, T. F.-
Autor(es): dc.creatorKrause, E.-
Autor(es): dc.creatorChang, C.-
Autor(es): dc.creatorOmori, Y.-
Autor(es): dc.creatorAmon, A.-
Autor(es): dc.creatorBaxter, E.-
Autor(es): dc.creatorElvin-Poole, J.-
Autor(es): dc.creatorHuterer, D.-
Autor(es): dc.creatorPalmese, A.-
Autor(es): dc.creatorPaz-Chinchon, F.-
Autor(es): dc.creatorPlazas, A. A.-
Autor(es): dc.creatorSanchez, E.-
Autor(es): dc.creatorScarpine, V.-
Autor(es): dc.creatorSerrano, S.-
Autor(es): dc.creatorSoares-Santos, M.-
Autor(es): dc.creatorSmith, M.-
Autor(es): dc.creatorSuchyta, E.-
Autor(es): dc.creatorTarle, G.-
Autor(es): dc.creatorThomas, D.-
Autor(es): dc.creatorToo, C.-
Autor(es): dc.creatorVarga, T. N.-
Autor(es): dc.creatorWeller, J.-
Autor(es): dc.creatorWilkinson, R. D.-
Data de aceite: dc.date.accessioned2025-08-21T20:38:45Z-
Data de disponibilização: dc.date.available2025-08-21T20:38:45Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2021-11-30-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1093/mnras/stab2384-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/229920-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/229920-
Descrição: dc.descriptionWe describe and test the fiducial covariance matrix model for the combined two-point function analysis of the Dark Energy Survey Year 3 (DES-Y3) data set. Using a variety of new ansatzes for covariance modelling and testing, we validate the assumptions and approximations of this model. These include the assumption of Gaussian likelihood, the trispectrum contribution to the covariance, the impact of evaluating the model at a wrong set of parameters, the impact of masking and survey geometry, deviations from Poissonian shot noise, galaxy weighting schemes, and other sub-dominant effects. We find that our covariance model is robust and that its approximations have little impact on goodness of fit and parameter estimation. The largest impact on best-fitting figure-of-merit arises from the so-called fsky approximation for dealing with finite survey area, which on average increases the χ2 between maximum posterior model and measurement by $3.7{{\ \rm per\ cent} (Δχ2 ≈ 18.9). Standard methods to go beyond this approximation fail for DES-Y3, but we derive an approximate scheme to deal with these features. For parameter estimation, our ignorance of the exact parameters at which to evaluate our covariance model causes the dominant effect. We find that it increases the scatter of maximum posterior values for ωm and σ8 by about $3{{\ \rm per\ cent} and for the dark energy equation-of-state parameter by about $5{{\ \rm per\ cent}.-
Descrição: dc.descriptionKavli Institute for Cosmology University of Cambridge, Madingley Road-
Descrição: dc.descriptionChurchill College University of Cambridge-
Descrição: dc.descriptionInstituto de Física Teórica Universidade Estadual Paulista-
Descrição: dc.descriptionLaboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77-
Descrição: dc.descriptionDepartment of Physics University of Michigan-
Descrição: dc.descriptionICTP South American Institute for Fundamental Research Instituto de Física Teórica Universidade Estadual Paulista-
Descrição: dc.descriptionFermi National Accelerator Laboratory, PO Box 500-
Descrição: dc.descriptionDepartment of Astronomy/Steward Observatory University of Arizona, 933 North Cherry Avenue-
Descrição: dc.descriptionJet Propulsion Laboratory California Institute of Technology, 4800 Oak Grove Drive-
Descrição: dc.descriptionDepartment of Astronomy and Astrophysics University of Chicago-
Descrição: dc.descriptionKavli Institute for Cosmological Physics University of Chicago-
Descrição: dc.descriptionKavli Institute for Particle Astrophysics and Cosmology Stanford University, PO Box 2450-
Descrição: dc.descriptionDepartment of Physics and Astronomy University of Hawaii, Watanabe 416, 2505 Correa Road-
Descrição: dc.descriptionCenter for Cosmology and Astro-Particle Physics Ohio State University-
Descrição: dc.descriptionDepartment of Physics Ohio State University-
Descrição: dc.descriptionInstitut d'Estudis Espacials de Catalunya (IEEC)-
Descrição: dc.descriptionInstitute of Space Sciences ICE CSIC Campus UAB, Carrer de Can Magrans, s/n-
Descrição: dc.descriptionSLAC National Accelerator Laboratory-
Descrição: dc.descriptionNational Center for Supercomputing Applications, 1205 West Clark Street-
Descrição: dc.descriptionDepartment of Physics Stanford University, 382 Via Pueblo Mall-
Descrição: dc.descriptionCentro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)-
Descrição: dc.descriptionInstitute of Cosmology and Gravitation University of Portsmouth-
Descrição: dc.descriptionDepartment of Physics and Astronomy Pevensey Building University of Sussex-
Descrição: dc.descriptionInstitute of Astronomy University of Cambridge, Madingley Road-
Descrição: dc.descriptionDepartment of Astrophysical Sciences Princeton University, Peyton Hall-
Descrição: dc.descriptionSchool of Physics and Astronomy University of Southampton-
Descrição: dc.descriptionComputer Science and Mathematics Division Oak Ridge National Laboratory-
Descrição: dc.descriptionMax Planck Institute for Extraterrestrial Physics, Giessenbachstrasse-
Descrição: dc.descriptionUniversitäts-Sternwarte Fakultät für Physik Ludwig-Maximilians Universität München, Scheinerstr 1-
Descrição: dc.descriptionInstituto de Física Teórica Universidade Estadual Paulista-
Descrição: dc.descriptionICTP South American Institute for Fundamental Research Instituto de Física Teórica Universidade Estadual Paulista-
Formato: dc.format3125-3165-
Idioma: dc.languageen-
Relação: dc.relationMonthly Notices of the Royal Astronomical Society-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectcosmology: observations-
Palavras-chave: dc.subjectlarge-scale structure of Universe-
Título: dc.titleDark Energy Survey year 3 results: covariance modelling and its impact on parameter estimation and quality of fit-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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