249 citations · 2k across the 59 of their papers we have counts for
60 papers
Nonlinear redshift space distortion in halo ellipticity correlations: Analytical model and N-body simulations
Teppei Okumura, Atsushi Taruya, Toshiki Kurita +1
We present an analytic model of nonlinear correlators of galaxy/halo ellipticities in redshift space. The three-dimensional ellipticity field is not affected by the redshift-space…
Mock Observatory: two thousand lightcone mock catalogues of luminous red galaxies from the Hyper Suprime-Cam Survey for the cosmological large-scale analysis
Shogo Ishikawa, Teppei Okumura, Takahiro Nishimichi
Estimating a reliable covariance matrix for correlation functions of galaxies is a crucial task to obtain accurate cosmological constraints from galaxy surveys. We generate 2,000 i…
Galaxy-dark matter connection of photometric galaxies from the HSC-SSP Survey: Galaxy-galaxy lensing and the halo model
Navin Chaurasiya, Surhud More, Shogo Ishikawa +3
We infer the connection between the stellar mass of galaxies from the Subaru Hyper Suprime-Cam (HSC) survey, and their dark matter halo masses and its evolution in two bins of reds…
Quadratic shape biases in three-dimensional halo intrinsic alignments
Kazuyuki Akitsu, Yin Li, Teppei Okumura
Understanding the nonlinear relation between the shapes of halos or galaxies and the surrounding matter distribution is essential in accurate modeling of their intrinsic alignments…
Statistical anisotropy in galaxy ellipticity correlations
Maresuke Shiraishi, Teppei Okumura, Kazuyuki Akitsu
As well as the galaxy number density and peculiar velocity, the galaxy intrinsic alignment can be used to test the cosmic isotropy. We study distinctive impacts of the isotropy bre…
First Constraints on Growth Rate from Redshift-Space Ellipticity Correlations of SDSS Galaxies at
Teppei Okumura, Atsushi Taruya
We report the first constraints on the growth rate of the universe, , with intrinsic alignments (IAs) of galaxies. We measure the galaxy density-intrinsic ellipticity c…
Cosmological gravity probes: connecting recent theoretical developments to forthcoming observations
Shun Arai, Katsuki Aoki, Yuji Chinone +20
Since the discovery of the accelerated expansion of the present Universe, significant theoretical developments have been made in the area of modified gravity. In the meantime, cosm…
Gravitational wave fossils in nonlinear regime: halo tidal bias and intrinsic alignments from gravitational wave separate universe simulations
Kazuyuki Akitsu, Yin Li, Teppei Okumura
We investigate impacts of long-wavelength gravitational waves (GWs) on nonlinear structure formation by utilizing the tidal separate universe simulations. Based on the equivalence…
Relativistic distortions in galaxy density-ellipticity correlations: gravitational redshift and peculiar velocity effects
Shohei Saga, Teppei Okumura, Atsushi Taruya +1
We study relativistic effects, arising from the light propagation in an inhomogeneous universe. We particularly investigate the effects imprinted in a cross-correlation function be…
Clustering of emission line galaxies with IllustrisTNG I.: fundamental properties and halo occupation distribution
Ken Osato, Teppei Okumura
Upcoming spectroscopic redshift surveys use emission line galaxies (ELGs) to trace the three-dimensional matter distributions with wider area coverage in the deeper Universe. Since…
Distinguishing between CDM and gravity models using halo ellipticity correlations in simulations
Yao-Tsung Chuang, Teppei Okumura, Masato Shirasaki
There is a growing interest in utilizing intrinsic alignment (IA) of galaxy shapes as a geometric and dynamical probe of cosmology. In this paper we present the first measurements…
Tightening geometric and dynamical constraints on dark energy and gravity: galaxy clustering, intrinsic alignment and kinetic Sunyaev-Zel'dovich effect
Teppei Okumura, Atsushi Taruya
Conventionally, in galaxy surveys, cosmological constraints on the growth and expansion history of the universe have been obtained from the measurements of redshift-space distortio…
First Evidence of Intrinsic Alignments of Red Galaxies at : Cross-correlation between CFHTLenS and FastSound Samples
Motonari Tonegawa, Teppei Okumura
We report the first evidence for intrinsic alignment (IA) of red galaxies at . We measure the gravitational shear-intrinsic ellipticity (GI) cross-correlation function at $z\s…
Halo-model analysis of the clustering of photometric luminous red galaxies at from the Subaru Hyper Suprime-Cam Survey
Shogo Ishikawa, Teppei Okumura, Masamune Oguri +1
We present the clustering analysis of photometric luminous red galaxies (LRGs) at a redshift range of using photometric LRGs selected from the Hyper…
Alcock-Paczynski effects on wide-angle galaxy statistics
Maresuke Shiraishi, Kazuyuki Akitsu, Teppei Okumura
The Alcock-Paczynski (AP) effect is a geometrical distortion in three-dimensional observed galaxy statistics. In anticipation of precision cosmology based on ongoing and upcoming a…
Wide-angle effects on galaxy ellipticity correlations
Maresuke Shiraishi, Atsushi Taruya, Teppei Okumura +1
We show an efficient way to compute wide-angle or all-sky statistics of galaxy intrinsic alignment in three-dimensional configuration space. For this purpose, we expand the two-poi…
Angular clustering and host halo properties of [OII] emitters at in the Subaru HSC survey
Teppei Okumura, Masao Hayashi, I-Non Chiu +4
We study the angular correlation function of star-forming galaxies and properties of their host dark matter halos at z>1 using the Hyper-Suprime Cam (HSC) SSP survey. We use [OII]…
Cosmological simulation in tides: power spectra and halo shape responses, and shape assembly bias
Kazuyuki Akitsu, Yin Li, Teppei Okumura
The well-developed separate universe technique enables accurate calibration of the response of any observable to an isotropic long-wavelength density fluctuation. The large-scale e…
Minimum variance estimation of statistical anisotropy via galaxy survey
Maresuke Shiraishi, Teppei Okumura, Kazuyuki Akitsu
We consider the benefits of measuring cosmic statistical anisotropy from redshift-space correlators of the galaxy number density fluctuation and the peculiar velocity field without…
Standard candles and sirens rescue
Aniket Agrawal, Teppei Okumura, Toshifumi Futamase
We show that future observations of binary neutron star systems with electromagnetic counterparts together with the traditional probes of low- and high-redshift Type Ia supernovae…
New measures to test modified gravity cosmologies
Jiro Matsumoto, Teppei Okumura, Misao Sasaki
The observed accelerated expansion of the Universe may be explained by dark energy or the breakdown of general relativity (GR) on cosmological scales. When the latter case, a modif…
A clustering-based self-calibration of the richness-to-mass relation of CAMIRA galaxy clusters out to in the Hyper Suprime-Cam survey
I-Non Chiu, Teppei Okumura, Masamune Oguri +3
We perform a self-calibration of the richness-to-mass (-) relation of CAMIRA galaxy clusters with richness at redshift by modeling redshift-space tw…
Minimum variance estimation of galaxy power spectrum in redshift space
Maresuke Shiraishi, Teppei Okumura, Naonori S. Sugiyama +1
We study an efficient way to enhance the measurability of the galaxy density and/or velocity power spectrum in redshift space. It is based on the angular decomposition with the Tri…
Testing tidal alignment models for anisotropic correlations of halo ellipticities with N-body simulations
Teppei Okumura, Atsushi Taruya, Takahiro Nishimichi
There is a growing interest of using the intrinsic alignment (IA) of galaxy images as a tool to extract cosmological information complimentary to galaxy clustering analysis. Recent…