Primordial Non-Gaussianity and Gravitational Waves: Observational Tests of Brane Inflation in String Theory

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dc.creatorLidsey, James E.
dc.creatorSeery, David
dc.date2006-10-13
dc.date2007-02-05
dc.date.accessioned2026-07-07T10:23:53Z
dc.date.available2026-07-07T10:23:53Z
dc.descriptionWe study brane inflation scenarios in a warped throat geometry and show that there exists a consistency condition between the non-Gaussianity of the curvature perturbation and the amplitude and scale-dependence of the primordial gravitational waves. This condition is independent of the warping of the throat and the form of the inflaton potential. We find that such a relation could be tested by a future CMB polarization experiment if the Planck satellite is able to detect both a gravitational wave background and a non-Gaussian statistic. In models where the observable stage of inflation occurs when the brane is in the tip region of the throat, we derive a further consistency condition involving the scalar spectral index, the tensor-scalar ratio and the curvature perturbation bispectrum. We show that when such a relation is combined with the WMAP3 results, it leads to a model-independent bound on the gravitational wave amplitude given by 0.001 < r < 0.01. This corresponds to the range of sensitivity of the next generation of CMB polarization experiments.
dc.description7 pages, uses RevTeX4. v2, replaced with version accepted by Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/astro-ph/0610398
dc.identifierhttp://arxiv.org/abs/astro-ph/0610398
dc.identifierPhys.Rev.D75:043505,2007
dc.identifierdoi:10.1103/PhysRevD.75.043505
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175995
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titlePrimordial Non-Gaussianity and Gravitational Waves: Observational Tests of Brane Inflation in String Theory
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