Gravitational Wave Constraints on DBI Inflation

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dc.creatorLidsey, James E.
dc.creatorHuston, Ian
dc.date2007-05-02
dc.date2007-07-04
dc.date.accessioned2026-07-07T10:59:54Z
dc.date.available2026-07-07T10:59:54Z
dc.descriptionAn upper bound on the amplitude of the primordial gravitational wave spectrum generated during ultra-violet DBI inflation is derived. The bound is insensitive to the form of the inflaton potential and the warp factor of the compactified dimensions and can be expressed entirely in terms of observational parameters once the volume of the five-dimensional sub-manifold of the throat has been specified. For standard type IIB compactification schemes, the bound predicts undetectably small tensor perturbations with a tensor-scalar ratio $r < 10^{-7}$. This is incompatible with a corresponding lower limit of $r > 0.1 (1-n_s)$, which applies to any model that generates a red spectral index $n_s <1$ and a potentially detectable non-Gaussianity in the curvature perturbation. Possible ways of evading these bounds in more general DBI-type scenarios are discussed and a multiple-brane model is investigated as a specific example.
dc.description18 pages; V2: added references, version as published in JCAP
dc.identifierhttps://arxiv.org/abs/0705.0240
dc.identifierhttp://arxiv.org/abs/0705.0240
dc.identifierJCAP0707:002,2007
dc.identifierdoi:10.1088/1475-7516/2007/07/002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187562
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleGravitational Wave Constraints on DBI Inflation
dc.typetext

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