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dc.contributor.authorCarneiro, Saulo-
dc.contributor.authorPereira, Thiago S.-
dc.contributor.authorMarugan, Guillermo A. Mena-
dc.creatorCarneiro, Saulo-
dc.creatorPereira, Thiago S.-
dc.creatorMarugan, Guillermo A. Mena-
dc.descriptionTexto completo: acesso restrito. p. 1-18pt_BR
dc.description.abstractIn this work, the linear and gauge-invariant theory of cosmological perturbations in a class of anisotropic and shear-free spacetimes is developed. After constructing an explicit set of complete eigenfunctions in terms of which perturbations can be expanded, we identify the effective degrees of freedom during a generic slow-roll inflationary phase. These correspond to the anisotropic equivalent of the standard Mukhanov-Sasaki variables. The associated equations of motion present a remarkable resemblance to those found in perturbed Friedmann-Robertson-Walker spacetimes with curvature, apart from the spectrum of the Laplacian, which exhibits the characteristic frequencies of the underlying geometry. In particular, it is found that the perturbations cannot develop arbitrarily large super-Hubble modes.pt_BR
dc.rightsAcesso Abertopt_BR
dc.source 10.1088/1475-7516/2012/05/040pt_BR
dc.subjectCosmological perturbation theorypt_BR
dc.subjectPrimordial gravitational waves (theory)pt_BR
dc.titleInflationary perturbations in anisotropic, shear-free universespt_BR
dc.title.alternativeJournal of Cosmology and Astroparticle Physicspt_BR
dc.typeArtigo de Periódicopt_BR
Appears in Collections:Artigo Publicado em Periódico (FIS)

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