Non-Gaussian deflections in iterative optimal CMB lensing reconstruction

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Autor(es): dc.contributorUniversité de Genève-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorInstitute of Astronomy-
Autor(es): dc.contributorKavli Institute for Cosmology Cambridge-
Autor(es): dc.contributorCardiff University-
Autor(es): dc.contributorFlatiron Institute-
Autor(es): dc.creatorDarwish, Omar-
Autor(es): dc.creatorBelkner, Sebastian-
Autor(es): dc.creatorLegrand, Louis-
Autor(es): dc.creatorCarron, Julien-
Autor(es): dc.creatorFabbian, Giulio-
Data de aceite: dc.date.accessioned2025-08-21T18:42:55Z-
Data de disponibilização: dc.date.available2025-08-21T18:42:55Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2024-11-14-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1103/PhysRevD.110.103520-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/301295-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/301295-
Descrição: dc.descriptionThe gravitational lensing signal from the cosmic microwave background (CMB) is highly valuable to constrain the growth of the structures in the Universe in a clean and robust manner over a wide range of redshifts. One of the theoretical systematics for lensing reconstruction is the impact of the lensing field non-Gaussianities on its estimators. Nonlinear matter clustering and post-Born lensing corrections are known to bias standard quadratic estimators to some extent, most significantly so in temperature. In this work, we explore the impact of non-Gaussian deflections on maximum a posteriori lensing estimators, which, in contrast to quadratic estimators, are able to provide optimal measurements of the lensing field. We show that these naturally reduce the induced non-Gaussian bias and lead to unbiased cosmological constraints in Λ cold dark matter at CMB-S4 noise levels without the need for explicit modeling. We also test the impact of assuming a non-Gaussian prior for the reconstruction; this mitigates the effect further slightly, but generally has little impact on the quality of the reconstruction. This shows that higher-order statistics of the lensing deflections are not expected to present a major challenge for optimal CMB lensing reconstruction in the foreseeable future.-
Descrição: dc.descriptionDépartement de Physique Théorique et CAP Université de Genève, 24 Quai Ansermet-
Descrição: dc.descriptionInstituto de Física Teórica da Universidade Estadual Paulista ICTP South American Institute for Fundamental Research, Rua Dr. Bento Teobaldo Ferraz, 271, Bloco II, Barra-Funda, SP-
Descrição: dc.descriptionInstitute of Astronomy, Madingley Road-
Descrição: dc.descriptionKavli Institute for Cosmology Cambridge, Madingley Road-
Descrição: dc.descriptionSchool of Physics and Astronomy Cardiff University, The Parade, Wales-
Descrição: dc.descriptionCenter for Computational Astrophysics Flatiron Institute, 162 Fifth Avenue-
Descrição: dc.descriptionInstituto de Física Teórica da Universidade Estadual Paulista ICTP South American Institute for Fundamental Research, Rua Dr. Bento Teobaldo Ferraz, 271, Bloco II, Barra-Funda, SP-
Idioma: dc.languageen-
Relação: dc.relationPhysical Review D-
???dc.source???: dc.sourceScopus-
Título: dc.titleNon-Gaussian deflections in iterative optimal CMB lensing reconstruction-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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