LiteBIRD science goals and forecasts. E-mode anomalies

Various so-called anomalies have been found in both the WMAP and Planck cosmic microwave background (CMB) temperature data that exert a mild tension against the highly successful best-fit 6 parameter cosmological model, potentially providing hints of new physics to be explored. That these are real f...

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Autores: Banday, Anthony, Gimeno Amo, Crhistian, Diego Palazuelos, Patricia, Hoz, Elena de la, Gruppuso, Alessandro, Raffuzzi, Niccolò, Martínez González, E., Vielva, Patricio, Barreiro, R. B., López-Caniego Alcarria, Marcos, Et. al.
Tipo de recurso: artículo
Fecha de publicación:2026
País:España
Institución:Universidad Europea (UEM)
Repositorio:ABACUS. Repositorio de Producción Científica
Idioma:inglés
OAI Identifier:oai:dnet:abacusreposi::6b5672a69a7cd2518633b5837ad79082
Acceso en línea:https://hdl.handle.net/11268/17039
Access Level:acceso abierto
Palabra clave:Física
Cosmología
Matemáticas estadísticas
Procesamiento de datos
Goal 4: Quality education
Goal 17: Partnerships
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spelling LiteBIRD science goals and forecasts. E-mode anomaliesBanday, AnthonyGimeno Amo, CrhistianDiego Palazuelos, PatriciaHoz, Elena de laGruppuso, AlessandroRaffuzzi, NiccolòMartínez González, E.Vielva, PatricioBarreiro, R. B.López-Caniego Alcarria, MarcosEt. al.FísicaCosmologíaMatemáticas estadísticasProcesamiento de datosGoal 4: Quality educationGoal 17: PartnershipsVarious so-called anomalies have been found in both the WMAP and Planck cosmic microwave background (CMB) temperature data that exert a mild tension against the highly successful best-fit 6 parameter cosmological model, potentially providing hints of new physics to be explored. That these are real features on the sky is uncontested. However, given their modest significance, whether they are indicative of true departures from the standard cosmology or simply statistical excursions due to a mildly unusual configuration of temperature anisotropies on the sky which we refer to as the “fluke hypothesis” cannot be addressed further without new information. No theoretical model of primordial perturbations has to date been constructed that can explain all of the temperature anomalies. Therefore, we focus in this paper on testing the fluke hypothesis, based on the partial correlation between the temperature and E-mode CMB polarisation signal. In particular, we compare the properties of specific statistics in polarisation, built from unconstrained realisations of the ΛCDM cosmological model as might be observed by the LiteBIRD satellite, with those determined from constrained simulations, where the part of the E-mode anisotropy correlated with temperature is constrained by observations of the latter. Specifically, we use inpainted Planck 2018 SMICA temperature data to constrain the E-mode realisations. Subsequent analysis makes use of masks defined to minimise the impact of the inpainting procedure on the E-mode map statistics. We find that statistical assessments of the E-mode data alone do not provide any evidence for or against the fluke hypothesis. However, tests based on cross-statistical measures determined from temperature and E modes can allow this hypothesis to be rejected with a moderate level of probability.20262026-04-2220262026-01-0120262026-01-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/11268/17039reponame:ABACUS. Repositorio de Producción Científicainstname:Universidad Europea (UEM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:dnet:abacusreposi::6b5672a69a7cd2518633b5837ad790822026-06-11T12:41:27Z
dc.title.none.fl_str_mv LiteBIRD science goals and forecasts. E-mode anomalies
title LiteBIRD science goals and forecasts. E-mode anomalies
spellingShingle LiteBIRD science goals and forecasts. E-mode anomalies
Banday, Anthony
Física
Cosmología
Matemáticas estadísticas
Procesamiento de datos
Goal 4: Quality education
Goal 17: Partnerships
title_short LiteBIRD science goals and forecasts. E-mode anomalies
title_full LiteBIRD science goals and forecasts. E-mode anomalies
title_fullStr LiteBIRD science goals and forecasts. E-mode anomalies
title_full_unstemmed LiteBIRD science goals and forecasts. E-mode anomalies
title_sort LiteBIRD science goals and forecasts. E-mode anomalies
dc.creator.none.fl_str_mv Banday, Anthony
Gimeno Amo, Crhistian
Diego Palazuelos, Patricia
Hoz, Elena de la
Gruppuso, Alessandro
Raffuzzi, Niccolò
Martínez González, E.
Vielva, Patricio
Barreiro, R. B.
López-Caniego Alcarria, Marcos
Et. al.
author Banday, Anthony
author_facet Banday, Anthony
Gimeno Amo, Crhistian
Diego Palazuelos, Patricia
Hoz, Elena de la
Gruppuso, Alessandro
Raffuzzi, Niccolò
Martínez González, E.
Vielva, Patricio
Barreiro, R. B.
López-Caniego Alcarria, Marcos
Et. al.
author_role author
author2 Gimeno Amo, Crhistian
Diego Palazuelos, Patricia
Hoz, Elena de la
Gruppuso, Alessandro
Raffuzzi, Niccolò
Martínez González, E.
Vielva, Patricio
Barreiro, R. B.
López-Caniego Alcarria, Marcos
Et. al.
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv Física
Cosmología
Matemáticas estadísticas
Procesamiento de datos
Goal 4: Quality education
Goal 17: Partnerships
topic Física
Cosmología
Matemáticas estadísticas
Procesamiento de datos
Goal 4: Quality education
Goal 17: Partnerships
description Various so-called anomalies have been found in both the WMAP and Planck cosmic microwave background (CMB) temperature data that exert a mild tension against the highly successful best-fit 6 parameter cosmological model, potentially providing hints of new physics to be explored. That these are real features on the sky is uncontested. However, given their modest significance, whether they are indicative of true departures from the standard cosmology or simply statistical excursions due to a mildly unusual configuration of temperature anisotropies on the sky which we refer to as the “fluke hypothesis” cannot be addressed further without new information. No theoretical model of primordial perturbations has to date been constructed that can explain all of the temperature anomalies. Therefore, we focus in this paper on testing the fluke hypothesis, based on the partial correlation between the temperature and E-mode CMB polarisation signal. In particular, we compare the properties of specific statistics in polarisation, built from unconstrained realisations of the ΛCDM cosmological model as might be observed by the LiteBIRD satellite, with those determined from constrained simulations, where the part of the E-mode anisotropy correlated with temperature is constrained by observations of the latter. Specifically, we use inpainted Planck 2018 SMICA temperature data to constrain the E-mode realisations. Subsequent analysis makes use of masks defined to minimise the impact of the inpainting procedure on the E-mode map statistics. We find that statistical assessments of the E-mode data alone do not provide any evidence for or against the fluke hypothesis. However, tests based on cross-statistical measures determined from temperature and E modes can allow this hypothesis to be rejected with a moderate level of probability.
publishDate 2026
dc.date.none.fl_str_mv 2026
2026-04-22
2026
2026-01-01
2026
2026-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/11268/17039
url https://hdl.handle.net/11268/17039
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:ABACUS. Repositorio de Producción Científica
instname:Universidad Europea (UEM)
instname_str Universidad Europea (UEM)
reponame_str ABACUS. Repositorio de Producción Científica
collection ABACUS. Repositorio de Producción Científica
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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