Circular Polarization of Primordial Gravitational Waves in String-inspired Inflationary Cosmology

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dc.creatorSatoh, Masaki
dc.creatorKanno, Sugumi
dc.creatorSoda, Jiro
dc.date2007-06-25
dc.date2008-03-10
dc.date.accessioned2026-07-07T11:17:11Z
dc.date.available2026-07-07T11:17:11Z
dc.descriptionWe study a mechanism to produce the circular polarization of primordial gravitational waves. The circular polarization is generated during the super-inflation driven by the Gauss-Bonnet term in the string-inspired cosmology. The instability in the tensor mode caused by the Gauss-Bonnet term and the parity violation due to the gravitational Chern-Simons term are the essential ingredients of the mechanism. We also discuss detectability of the produced circular polarization of gravitational waves. It turns out that the simple model of single-field inflation contradicts CMB observations. To circumvent this difficulty, we propose a two-field inflation model. In this two-field model, the circular polarization of gravitational waves is created in the frequency range designed by the Big-Bang Observer (BBO) or the deci-hertz gravitational-wave observatory (DECIGO).
dc.description11 pages, 7 figures, added new discussions, published version(v3), added references(v4)
dc.identifierhttps://arxiv.org/abs/0706.3585
dc.identifierhttp://arxiv.org/abs/0706.3585
dc.identifierPhys.Rev.D77:023526,2008
dc.identifierdoi:10.1103/PhysRevD.77.023526
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/192921
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleCircular Polarization of Primordial Gravitational Waves in String-inspired Inflationary Cosmology
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