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Non-Gaussian Error Contribution to Likelihood Analysis of the Matter Power Spectrum
Ryuichi Takahashi, Naoki Yoshida, Masahiro Takada +6
We study the sample variance of the matter power spectrum for the standard Lambda Cold Dark Matter universe. We use a total of 5000 cosmological N-body simulations to study in deta…
Scale Dependence of Halo Bispectrum from Non-Gaussian Initial Conditions in Cosmological N-body Simulations
Takahiro Nishimichi, Atsushi Taruya, Kazuya Koyama +1
We study the halo bispectrum from non-Gaussian initial conditions. Based on a set of large -body simulations starting from initial density fields with local type non-Gaussianity…
Systematic Survey of the Correlation between Northern HECR Events and SDSS Galaxies
Hajime Takami, Takahiro Nishimichi, Katsuhiko Sato
We investigated the spatial correlation between the arrival directions of the highest energy cosmic rays (HECRs) detected by the Akeno Giant Air Shower Array (AGASA) with energies…
Non-linear Evolution of Baryon Acoustic Oscillations from Improved Perturbation Theory in Real and Redshift Spaces
Atsushi Taruya, Takahiro Nishimichi, Shun Saito +1
We study the non-linear evolution of baryon acoustic oscillations in the matter power spectrum and correlation function from the improved perturbation theory (PT). Based on the fra…
Confronting the damping of the baryon acoustic oscillations with observation
Hidenori Nomura, Kazuhiro Yamamoto, Gert Huetsi +1
We investigate the damping of the baryon acoustic oscillations in the matter power spectrum due to the quasinonlinear clustering and redshift-space distortions by confronting the m…
Simulations of Baryon Acoustic Oscillations II: Covariance matrix of the matter power spectrum
Ryuichi Takahashi, Naoki Yoshida, Masahiro Takada +7
We use 5000 cosmological N-body simulations of 1(Gpc/h)^3 box for the concordance LCDM model in order to study the sampling variances of nonlinear matter power spectrum. We show th…