Third-Order Density Perturbation and One-Loop Power Spectrum in Dark-Energy-Dominated Universe

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dc.creatorTakahashi, Ryuichi
dc.date2008-06-09
dc.date2008-08-21
dc.date.accessioned2026-07-07T12:14:42Z
dc.date.available2026-07-07T12:14:42Z
dc.descriptionWe 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 ($k \approx 0.1h$/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 de-Sitter) 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.
dc.description11 pages, Prog. Ther. Phys. in press, minor changes, references added
dc.identifierhttps://arxiv.org/abs/0806.1437
dc.identifierhttp://arxiv.org/abs/0806.1437
dc.identifierProg.Theor.Phys.120:549-559,2008
dc.identifierdoi:10.1143/PTP.120.549
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211280
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleThird-Order Density Perturbation and One-Loop Power Spectrum in Dark-Energy-Dominated Universe
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