Tensor perturbations during inflation in a spatially closed universe

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dc.creatorBéatrice Bonga
dc.creatorBrajesh Gupt
dc.creatorNelson de Oliveira Yokomizo
dc.date.accessioned2025-08-29T18:23:36Z
dc.date.accessioned2025-09-08T23:05:50Z
dc.date.available2025-08-29T18:23:36Z
dc.date.issued2017
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.identifier.doihttps://doi.org/10.1088/1475-7516/2017/05/021
dc.identifier.issn1475-7516
dc.identifier.urihttps://hdl.handle.net/1843/84728
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.rightsAcesso Restrito
dc.subjectCosmologia
dc.subject.otherCosmological perturbation theory
dc.subject.otherInflation
dc.subject.otherPhysics of the early universe
dc.subject.otherCMBR theory
dc.titleTensor perturbations during inflation in a spatially closed universe
dc.typeArtigo de periódico
local.citation.epage20
local.citation.issue5
local.citation.spage1
local.citation.volume2017
local.description.resumoIn a recent paper [1], we studied the evolution of the background geometry and scalar perturbations in an inflationary, spatially closed Friedmann-Lemaȋtre-Robertson-Walker (FLRW) model having constant positive spatial curvature and spatial topology S3. Due to the spatial curvature, the early phase of slow-roll inflation is modified, leading to suppression of power in the scalar power spectrum at large angular scales. In this paper, we extend the analysis to include tensor perturbations. We find that, similarly to the scalar perturbations, the tensor power spectrum also shows suppression for long wavelength modes. The correction to the tensor spectrum is limited to the very long wavelength modes, therefore the resulting observable CMB B-mode polarization spectrum remains practically the same as in the standard scenario with flat spatial sections. However, since both the tensor and scalar power spectra are modified, there are scale dependent corrections to the tensor-to-scalar ratio that leads to violation of the standard slow-roll consistency relation.
local.identifier.orcidhttps://orcid.org/0000-0002-5808-9517
local.identifier.orcidhttp://orcid.org/0000-0002-0732-8733
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://iopscience.iop.org/article/10.1088/1475-7516/2017/05/021

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