Post-inflationary behavior of adiabatic perturbations and tensor-to-scalar ratio
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Accession number;05A0924084
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| Title;Post-inflationary behavior of adiabatic perturbations and tensor-to-scalar ratio |
| Author;
LINDE ANDREI
(Stanford Univ., Ca, Usa)
LINDE ANDREI
(Kyoto Univ., Kyoto, Jpn)
MUKHANOV VIATCHESLAV
(Lmu, Munich, Deu)
SASAKI MISAO
(Kyoto Univ., Kyoto, Jpn)
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Journal Title;YITP
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Journal Code:L0911B
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ISSN:
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VOL.;NO.05-41;PAGE.8P(2005)
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| Figure&Table&Reference;REF.72 |
| Pub. Country;Japan |
| Language;English |
| Abstract;The reason is explained why it is difficult (or even more impossible) to increase, during the post-inflationary evolution of the universe, the cosmological tensor-to-scalar perturbation ratio. For the suppression of the adiabatic perturbation of the tensor field (gravitational wave), two possible mechanisms are considered: damping of initial perturbations by the late-time entropy release and cancellation of initial adiabatic perturbations. To make the conclusions intuitively clear, the reason is explained for a simple example of isentropic ideal hydrodynamical fluids. Nonetheless, it is pointed out that the tensor perturbations can be relatively large in the simplest inflationary models respecting all the rules of quantum field theory. |
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