Revising the observable consequences of slow-roll inflation
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Revising the observable consequences of slow-roll inflation

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Revising the observable consequences of slow-roll inflation

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dc.contributor.author Agulló, Iván
dc.contributor.author Navarro Salas, José
dc.contributor.author Olmo Alba, Gonzalo
dc.contributor.author Parker, Leonard
dc.date.accessioned 2014-03-31T12:30:26Z
dc.date.available 2014-03-31T12:30:26Z
dc.date.issued 2010
dc.identifier.uri http://dx.doi.org/10.1103/PhysRevD.81.043514
dc.identifier.uri http://hdl.handle.net/10550/33874
dc.description.abstract We study the generation of primordial perturbations in a (single-field) slow-roll inflationary Universe. In momentum space, these (Gaussian) perturbations are characterized by a zero mean and a nonzero variance Delta(2) (k, t). However, in position space the variance diverges in the ultraviolet. The requirement of a finite variance in position space forces one to regularize Delta(2) (k, t). This can (and should) be achieved by proper renormalization in an expanding Universe in a unique way. This affects the predicted scalar and tensorial power spectra (evaluated when the modes acquire classical properties) for wavelengths that today are at observable scales. As a consequence, the imprint of slow-roll inflation on the cosmic microwave background anisotropies is significantly altered. We find a nontrivial change in the consistency condition that relates the tensor-to-scalar ratio r to the spectral indices. For instance, an exact scale-invariant tensorial power spectrum, n(t) = 0, is now compatible with a nonzero ratio r approximate to 0.12 +/- 0.06, which is forbidden by the standard prediction (r = -8n(t)). The influence of relic gravitational waves on the cosmic microwave background may soon come within the range of planned measurements, offering a nontrivial test of the new predictions.
dc.relation.ispartof Physical Review D, 2010, vol. 81, num. 4, p. 043514-1-043514-14
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Agulló, Iván Navarro Salas, José Olmo, Gonzalo J. Parker, Leonard 2010 Revising the observable consequences of slow-roll inflation Physical Review D 81 4 043514-1 043514-14
dc.subject Astrofísica
dc.subject Univers inflacionari
dc.title Revising the observable consequences of slow-roll inflation
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-03-31T12:30:26Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.81.043514
dc.identifier.idgrec 063469

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