no code implementations • 4 Oct 2020 • Ryuichi Takahashi, Kunihito Ioka, Asuka Mori, Koki Funahashi
We provide analytical fitting functions for the free-electron abundance and its bias factor.
Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
no code implementations • 27 Dec 2018 • Toshiya Namikawa, Benjamin Bose, François R. Bouchet, Ryuichi Takahashi, Atsushi Taruya
Following on an earlier paper, we test analytical predictions of the CMB lensing bi-spectrum against full-sky lensing simulations, and discuss their validity and limitation in detail.
Cosmology and Nongalactic Astrophysics
2 code implementations • 5 Jun 2017 • Ryuichi Takahashi, Takashi Hamana, Masato Shirasaki, Toshiya Namikawa, Takahiro Nishimichi, Ken Osato, Kosei Shiroyama
The data sets include full-sky convergence and shear maps from redshifts $z=0. 05$ to $5. 3$ at intervals of $150 \, h^{-1}{\rm Mpc}$ comoving radial distance (corresponding to a redshift interval of $\Delta z \simeq 0. 05$ at the nearby universe), enabling the construction of a mock shear catalog for an arbitrary source distribution up to $z=5. 3$.
Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
no code implementations • 9 Oct 2013 • Toshiya Namikawa, Ryuichi Takahashi
The contamination from beam asymmetry and polarization angle uncertainties, however, can generate mean-field biases for the EB estimator.
Cosmology and Nongalactic Astrophysics
no code implementations • 1 Sep 2012 • Toshiya Namikawa, Duncan Hanson, Ryuichi Takahashi
We present new methods for lensing reconstruction from CMB temperature fluctuations which have smaller mean-field and reconstruction noise bias corrections than current lensing estimators, with minimal loss of signal-to-noise.
Cosmology and Nongalactic Astrophysics
1 code implementation • 13 Aug 2012 • Ryuichi Takahashi, Masanori Sato, Takahiro Nishimichi, Atsushi Taruya, Masamune Oguri
The simulation results are used to re-calibrate the fitting parameters of the halofit model so as to reproduce small-scale power spectra of the $N$-body simulations, while keeping the precision at large scales.
Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
