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Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropies
Chiaki Hikage, Kazuya Koyama, Takahiko Matsubara +2
We study the effect of primordial isocurvature perturbations on non-Gaussian properties of CMB temperature anisotropies. We consider generic forms of the non-linearity of isocurvat…
Limits on Primordial Non-Gaussianity from Minkowski Functionals of the WMAP Temperature Anisotropies
Chiaki Hikage, Takahiko Matsubara, Peter Coles +3
We present an analysis of the Minkowski Functionals (MFs) describing the WMAP three-year temperature maps to place limits on possible levels of primordial non-Gaussianity. In parti…
Large-Scale Anisotropic Correlation Function of SDSS Luminous Red Galaxies
Teppei Okumura, Takahiko Matsubara, Daniel J. Eisenstein +4
We study the large-scale anisotropic two-point correlation function using 46,760 luminous red galaxies at redshifts 0.16 -- 0.47 from the Sloan Digital Sky Survey. We measure the c…
The Effect of Primordial Non--Gaussianity on the Topology of Large-Scale Structure
Chiaki Hikage, Peter Coles, Margherita Grossi +4
We study the effect of primordial non-Gaussianity on the development of large-scale cosmic structure using high-resolution N-body simulations. In particular, we focus on the topolo…
Galaxy clustering constraints on deviations from Newtonian gravity at cosmological scales II: Perturbative and numerical analyses of power spectrum and bispectrum
Akihito Shirata, Yasushi Suto, Chiaki Hikage +2
We explore observational constraints on possible deviations from Newtonian gravity by means of large-scale clustering of galaxies. We measure the power spectrum and the bispectrum…
Bispectrum and Nonlinear Biasing of Galaxies: Perturbation Analysis, Numerical Simulation and SDSS Galaxy Clustering
Takahiro Nishimichi, Issha Kayo, Chiaki Hikage +5
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 perturba…