Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations

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dc.creatorBaumann, Daniel
dc.creatorIchiki, Kiyotomo
dc.creatorSteinhardt, Paul J.
dc.creatorTakahashi, Keitaro
dc.date2007-03-30
dc.date.accessioned2026-07-07T11:23:45Z
dc.date.available2026-07-07T11:23:45Z
dc.descriptionWe derive the complete spectrum of gravitational waves induced by primordial scalar perturbations ranging over all observable wavelengths. This scalar-induced contribution can be computed directly from the observed scalar perturbations and general relativity and is, in this sense, independent of the cosmological model for generating the perturbations. The spectrum is scale-invariant on small scales, but has an interesting scale-dependence on large and intermediate scales, where scalar-induced gravitational waves do not redshift and are hence enhanced relative to the background density of the Universe. This contribution to the tensor spectrum is significantly different in form from the direct model-dependent primordial tensor spectrum and, although small in magnitude, it dominates the primordial signal for some cosmological models. We confirm our analytical results by direct numerical integration of the equations of motion.
dc.description19 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/hep-th/0703290
dc.identifierhttp://arxiv.org/abs/hep-th/0703290
dc.identifierPhys.Rev.D76:084019,2007
dc.identifierdoi:10.1103/PhysRevD.76.084019
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194998
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleGravitational Wave Spectrum Induced by Primordial Scalar Perturbations
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