Large tensor-to-scalar ratio and low scale inflation

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dc.creatorAllahverdi, Rouzbeh
dc.creatorMazumdar, Anupam
dc.creatorMultamaki, Tuomas
dc.date2007-12-12
dc.date2008-04-03
dc.date.accessioned2026-07-07T09:29:47Z
dc.date.available2026-07-07T09:29:47Z
dc.descriptionIt is plausible that the scalar density perturbations are created by a relatively low scale model of inflation which predicts the CMB anisotropy and excites Standard Model baryon and cold dark matter, but negligible gravity waves. Nevertheless a significantly large tensor perturbations can be observed if there exists a prior phase of high scale inflation separated by a matter or radiation dominated epoch. In this paper we provide a simple example when the gravity waves generated at high scales trickle through the horizon of the second phase of inflation and leave a distinct imprint in the spectrum of the tensor modes. For a high scale inflation occurring at $H\sim 10^{13}$ GeV while the second phase of inflation happening at $H\sim 1$ GeV, the largest tensor to scalar ratio is bounded by $r_{\rm observed}\leq0.8$.
dc.description9 pages+8 figures; v2: small changes, added discussion, new figures
dc.identifierhttps://arxiv.org/abs/0712.2031
dc.identifierhttp://arxiv.org/abs/0712.2031
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/157916
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleLarge tensor-to-scalar ratio and low scale inflation
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