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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…
Accretion process onto super-spinning objects
Cosimo Bambi, Katherine Freese, Tomohiro Harada +2
The accretion process onto spinning objects in Kerr spacetimes is studied with numerical simulations. Our results show that accretion onto compact objects with Kerr parameter (char…
Early Black Hole Formation by Accretion of Gas and Dark Matter
Hideyuki Umeda, Naoki Yoshida, Ken Nomoto +3
We propose a model in which intermediate-mass black holes (IMBHs) with mass of ~10000 Msun are formed in early dark matter halos. We carry out detailed stellar evolution calculatio…
The onset of star formation in primordial haloes
Umberto Maio, Benedetta Ciardi, Naoki Yoshida +2
Star formation remains an unsolved problem in astrophysics. Numerical studies of large-scale structure simulations cannot resolve the whole process and their approach usually assum…
Structure Formation in the Early Universe
Naoki Yoshida
The standard theory of cosmic structure formation posits that the present-day rich structure of the Universe developed through gravitational amplification of tiny matter density fl…
Simulations of Wide-Field Weak Lensing Surveys I: Basic Statistics and Non-Gaussian Effects
Masanori Sato, Takashi Hamana, Ryuichi Takahashi +4
We study the lensing convergence power spectrum and its covariance for a standard LCDM cosmology. We run 400 cosmological N-body simulations and use the outputs to perform a total…