The Effect of Varying Sound Velocity on Primordial Curvature Perturbations(Astrophysics and Cosmology)
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概要
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We study the effects of sudden change in the sound velocity on primordial curvature perturbation spectrum in inflationary cosmology, assuming that the background evolution satisfies the slow-roll condition throughout. It is found that the power spectrum acquires oscillating features which are determined by the ratio of the sound speed before and after the transition and the wavenumeber which crosses the sound horizon at the transition, and their analytic expression is given. In some values of those parameters, the oscillating primordial power spectrum can better fit the observed Cosmic Microwave Background temperature anisotropy power spectrum than the simple power-law power spectrum, although introduction of such a new degree of freedom is not justified in the context of Akaike's Information Criterion.
- 2011-05-25
著者
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Nakashima Masahiro
Department Of Internal Medicine I National Defense Medical College
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Saito Ryo
Department Of Environmental Management Studies Information Mathematics Rakuno Gakuen University
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Nakashima Masahiro
Department Of Physics Graduate School Of Science The University Of Tokyo:research Center For The Ear
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TAKAMIZU Yu-ichi
Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo
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Yokoyama Jun'ichi
Research Center For The Early Universe (resceu) Graduate School Of Science The University Of Tokyo:i
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Saito Ryo
Department Of Physics Graduate School Of Science The University Of Tokyo:research Center For The Ear
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Saito Ryo
Department Of Bioscience And Bioinformatics Faculty Of Computer Science And Systems Engineering Kyus
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YOKOYAMA Junichi
Research Center for the Early Universe, School of Science, The University of Tokyo
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Takamizu Yu-ichi
Research Center For The Early Universe (resceu) Graduate School Of Science The University Of Tokyo
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Yokoyama Jun'ichi
Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo
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YOKOYAMA Jun'ichi
Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo:Institute for the Physics and Mathematics of the Universe, The University of Tokyo
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SAITO Ryo
Department of Physics, Graduate School of Science, The University of Tokyo:Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo
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