Phantom Boundary Crossing and Anomalous Growth Index of Fluctuations in Viable f(R) Models of Cosmic Acceleration(Astrophysics and Cosmology)

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概要

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• The evolution of a background space-time metric and subhorizon matter density pertur-bations in the Universe is numerically analyzed in viable f(R) models of present dark energy and cosmic acceleration. It is found that viable models generically exhibit recent crossing of the phantom boundary ω_<DE>=-1. Furthermore, it is shown that, as a consequence of the anomalous growth of density perturbations during the end of the matter-dominated stage, their growth index evolves nonmonotonically with time and may even become negative temporarily.

• 2010-05-25

著者

• MOTOHASHI Hayato

  Department of Physics, Graduate School of Science, The University of Tokyo

• STAROBINSKY Alexei

  Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo

• Starobinsky Alexei

  Research Center For The Early Universe (resceu) Graduate School Of Science The University Of Tokyo:l

• Motohashi Hayato

  Department Of Physics Graduate School Of Science The University Of Tokyo:research Center For The Ear

• Yokoyama Jun'ichi

  Univ. Tokyo Kashiwa Jpn

• Yokoyama Jun'ichi

  Univ. Tokyo Tokyo Jpn

• YOKOYAMA Junichi

  Research Center for the Early Universe, School of Science, The University of Tokyo

• Yokoyama Jun'ichi

  Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo

• 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

• MOTOHASHI Hayato

  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

関連論文

• Gravitational-Wave Constraints on the Abundance of Primordial Black Holes(Astrophysics and Cosmology)
• Phantom Boundary Crossing and Anomalous Growth Index of Fluctuations in Viable f(R) Models of Cosmic Acceleration(Astrophysics and Cosmology)
• Matter Power Spectrum in f(R) Gravity with Massive Neutrinos
• On the Realization of MSSM Inflation(Astrophysics and Cosmology)
• Phantom Boundary Crossing and Anomalous Growth Index of Fluctuations in Viable f(R) Models of Cosmic Acceleration
• The Effect of Varying Sound Velocity on Primordial Curvature Perturbations(Astrophysics and Cosmology)
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• Generalized G-Inflation : Inflation with the Most General Second-Order Field Equations(Astrophysics and Cosmology)
• Matter Power Spectrum in f(R) Gravity with Massive Neutrinos

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