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Bias-Hardened CMB Lensing with Polarization
Toshiya Namikawa, Ryuichi Takahashi
Polarization data will soon provide the best avenue for measurements of the CMB lensing potential, although it is potentially sensitive to several instrumental effects including be…
On the Systematic Errors of Cosmological-Scale Gravity Tests using Redshift Space Distortion: Non-linear Effects and the Halo Bias
Takashi Ishikawa, Tomonori Totani, Takahiro Nishimichi +3
Redshift space distortion (RSD) observed in galaxy redshift surveys is a powerful tool to test gravity theories on cosmological scales, but the systematic uncertainties must carefu…
Weak Lensing by Intergalactic Mini-Structures in Quadruple Lens Systems: Simulation and Detection
Ryuichi Takahashi, Kaiki Taro Inoue
We investigate the weak lensing effects of line-of-sight structures on quadruple images in quasar-galaxy strong lens systems based on N-body and ray-tracing simulations that can re…
Observational Upper Bound on the Cosmic Abundances of Negative-mass Compact Objects and Ellis Wormholes from the Sloan Digital Sky Survey Quasar Lens Search
Ryuichi Takahashi, Hideki Asada
The latest result in the Sloan Digital Sky Survey Quasar Lens Search (SQLS) has set the first cosmological constraints on negative-mass compact objects and Ellis wormholes. There a…