Kazuhiro Yahata

Cross-Correlation between UHECR Arrival Distribution and Large-Scale Structure (2008)

Takami, Hajime, Nishimichi, Takahiro, Yahata, Kazuhiro, Sato, Katsuhiko

We investigate correlation between the arrival directions of ultra-high-energy cosmic rays (UHECRs) and the large-scale structure (LSS) of the universe by using statistical quantities which can find...

Modeling Nonlinear Evolution of Baryon Acoustic Oscillations: Convergence Regime of N-body Simulations and Analytic Models (2008)

Nishimichi, Takahiro, Shirata, Akihito, Taruya, Atsushi, Yahata, Kazuhiro, Saito, Shun, Suto, Yasushi, ...

We use a series of cosmological N-body simulations and various analytic models to study the evolution of the matter power spectrum in real space in a \Lambda Cold Dark Matter universe. We compare the...

Simulations of Baryon Acoustic Oscillations I: Growth of Large-Scale Density Fluctuations (2008)

Takahashi, Ryuichi, Yoshida, Naoki, Matsubara, Takahiko, Sugiyama, Naoshi, Kayo, Issha, Nishimichi, Takahiro, ...

We critically examine how well the evolution of large-scale density perturbations is followed in cosmological $N$-body simulations. We first run a large volume simulation and perform a mode-by-mode...

Characteristic Scales of Baryon Acoustic Oscillations from Perturbation Theory: Non-linearity and Redshift-Space Distortion Effects (2007)

Nishimichi, Takahiro, Ohmuro, Hiroshi, Nakamichi, Masashi, Taruya, Atsushi, Yahata, Kazuhiro, Shirata, Akihito, ...

An acoustic oscillation of the primeval photon-baryon fluid around the decoupling time imprints a characteristic scale in the galaxy distribution today, known as the baryon acoustic oscillation (BAO)...

Bispectrum and nonlinear biasing of galaxies: perturbation analysis, numerical simulation and SDSS galaxy clustering (2007)

Nishimichi, Takahiro, Kayo, Issha, Hikage, Chiaki, Yahata, Kazuhiro, Taruya, Atsushi, Jing, Yi Peng, ...

Bispectrum and Nonlinear Biasing of Galaxies: Perturbation Analysis, Numerical Simulation and SDSS Galaxy Clustering (2006)

Nishimichi, Takahiro, Kayo, Issha, Hikage, Chiaki, Yahata, Kazuhiro, Taruya, Atsushi, Jing, Y. P., ...

We consider nonlinear biasing models of galaxies with particular attention to a correlation between linear and quadratic biasing coefficients, b_1 and b_2. We first derive perturbative expressions...

The effect of FIR emission from SDSS galaxies on the SFD Galactic extinction map (2006)

Yahata, Kazuhiro, Yonehara, Atsunori, Suto, Yasushi, Turner, Edwin L., Broadhurst, Tom, Finkbeiner, Douglas P.

We compare the most successful and widely used map of Galactic dust extinction, provided by Schlegel, Finkbeiner & Davis (1998; hereafter SFD), to the galaxy number counts in the Sloan Digital Sky...

Searching for modified gravity with baryon oscillations: from SDSS to wide field multiobject spectroscopy (WFMOS) (2006)

Yamamoto, Kazuhiro, Bassett, Bruce A., Nichol, Robert C., Suto, Yasushi, Yahata, Kazuhiro

We discuss how the baryon acoustic oscillation (BAO) signatures in the galaxy power spectrum can distinguish between modified gravity and the cosmological constant as the source of cosmic...

Large Scale Clustering of Sloan Digital Sky Survey Quasars: Impact of the Baryon Density and the Cosmological Constant (2004)

Yahata, Kazuhiro, Suto, Yasushi, Kayo, Issha, Matsubara, Takahiko, Connolly, Andrew, Berk, Daniel Vanden, ...

We report the first result of the clustering analysis of Sloan Digital Sky Survey (SDSS) quasars. We compute the two-point correlation function (2PCF) of SDSS quasars in redshift space at...