Conformal Inflation, Modulated Reheating, and WMAP5

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dc.creatorKobayashi, Takeshi
dc.creatorMukohyama, Shinji
dc.date2008-10-05
dc.date2009-04-04
dc.date.accessioned2026-07-07T13:13:52Z
dc.date.available2026-07-07T13:13:52Z
dc.descriptionWe investigate density perturbations generated through modulated reheating while inflation is driven by a conformally coupled scalar field. A large running of the spectral index is obtained, which reflects the basic nature of conformal inflation that higher-order time derivatives of the Hubble parameter during inflation are not necessarily small. This feature may allow us to distinguish between conformal inflation models and standard minimally coupled ones. We also investigate how the resulting fluctuations are modified when there is a deviation from an exact conformal coupling between the inflaton and gravity. Finally, we apply our results to the warped brane inflation model and see that observational bounds from the WMAP5 data suggest a blue tilted density perturbation spectrum.
dc.description7 pages, REVTeX4, v2: published version
dc.identifierhttps://arxiv.org/abs/0810.0810
dc.identifierhttp://arxiv.org/abs/0810.0810
dc.identifierPhys.Rev.D79:083501,2009
dc.identifierdoi:10.1103/PhysRevD.79.083501
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230030
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleConformal Inflation, Modulated Reheating, and WMAP5
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