Third-Order Density Perturbation and One-Loop Power Spectrum in Dark-Energy-Dominated Universe(Astrophysics and Cosmology)

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概要

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• We investigate the third-order density perturbation and the one-loop correction to the linear power spectrum in the dark-energy cosmological model. Our main interest is to understand the dark-energy effect on baryon acoustic oscillations in a quasi-nonlinear regime (k≈0.1h/Mpc). Analytical solutions and simple fitting formulae are presented for the dark-energy model with the general time-varying equation of state w(a). It turns out that the power spectrum coincides with the approximate result based on the EdS (Einstein deSitter) model within 1% for k<0.4h/Mpc at z=0 in the WMAP (Wilkinson Microwave Anisotropy Probe) 5yr best-fitting cosmological model, which suggests that the cosmological dependence is very small.

• 理論物理学刊行会の論文
• 2008-09-25

著者

• TAKAHASHI Ryuichi

  Department of Physics and Astrophysics, Nagoya University

• Takahashi Ryuichi

  Department Of Cardiovascular Surgery Saiseikai Utsunomiya Hospital

• Takahashi Ryuichi

  Department Of Physics And Astrophysics Nagoya University

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