Simulations of Wide-Field Weak Lensing Surveys I: Basic Statistics and Non-Gaussian Effects (2009)
Sato, Masanori, Hamana, Takashi, Takahashi, Ryuichi, Takada, Masahiro, Yoshida, Naoki, Matsubara, Takahiko, ...
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 of 1000 independent...
The Seventh Data Release of the Sloan Digital Sky Survey (2009)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, An, Deokkeun, ...
This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDSS-II. It includes...
Takahashi, Ryuichi, Yoshida, Naoki, Takada, Masahiro, Matsubara, Takahiko, Sugiyama, Naoshi, Kayo, Issha, ...
We use 5000 cosmological N-body simulations of 1(Gpc/h)^3 box for the concordance LCDM model in order to study the sampling variances of nonlinear matter power spectrum. We show that the non-Gaussian...
The seventh data release of the sloan digital sky survey (2009)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, An, Deokkeun, ...
Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropy (2008)
Hikage, Chiaki, Koyama, Kazuya, Matsubara, Takahiko, Takahashi, Tomo, Yamaguchi, Masahide
We study the effect of primordial isocurvature perturbations on non-Gaussian properties in CMB temperature anisotropies. We consider generic forms of the non-linearity of isocurvature perturbations...
Signature of primordial non-Gaussianity on the matter power spectrum (2008)
Taruya, Atsushi, Koyama, Kazuya, Matsubara, Takahiko
Employing the perturbative treatment of gravitational clustering, we discuss possible effects of primordial non-Gaussianity on the matter power spectrum. As gravitational clustering develops, the...
Nishimichi, Takahiro, Shirata, Akihito, Taruya, Atsushi, Yahata, Kazuhiro, Saito, Shun, Suto, Yasushi, ...
We use a series of cosmological N-body simulations and various analytic models to study the evolution of the matter power spectrum in real space in a \Lambda Cold Dark Matter universe. We compare the...
The nonlinear perturbation theory of gravitational instability is extended to include effects of both biasing and redshift-space distortions, which are inevitable in predicting observable quantities...
Signature of Primordial Non-Gaussianity on Matter Power Spectrum (2008)
Taruya, Atsushi, Koyama, Kazuya, Matsubara, Takahiko
Employing the perturbative treatment of gravitational clustering, we discuss possible effects of primordial non-Gaussianity on the matter power spectrum. As gravitational clustering develops, the...
The nonlinear perturbation theory of gravitational instability is extended to include effects of both biasing and redshift-space distortions, which are inevitable in predicting observable quantities...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Prieto, Carlos Allende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
We develop a new approach to study the nonlinear evolution in the large-scale structure of the Universe both in real space and in redshift space, extending the standard perturbation theory of...
Hikage, Chiaki, Matsubara, Takahiko, Coles, Peter, Liguori, Michele, Hansen, Frode K., Matarrese, Sabino
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 particular, we apply...
Simulations of Baryon Acoustic Oscillations I: Growth of Large-Scale Density Fluctuations (2008)
Takahashi, Ryuichi, Yoshida, Naoki, Matsubara, Takahiko, Sugiyama, Naoshi, Kayo, Issha, Nishimichi, Takahiro, ...
We critically examine how well the evolution of large-scale density perturbations is followed in cosmological $N$-body simulations. We first run a large volume simulation and perform a mode-by-mode...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the sloan digital sky survey (2008)
Adelman-McCarthy, Jennifer K., Agüros, Marcel A., Allam, Sahar S., Allende Prieto, Carlos, Anderson, Kurt S. J., Anderson, Scott F., ...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
The sixth data release of the Sloan Digital Sky Survey (2008)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Prieto, Carlos Alende, Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Sixth Data Release of the Sloan Digital Sky Survey. With this data release, the imaging of the northern Galactic cap is now complete. The survey contains images and...
Large-Scale Anisotropic Correlation Function of SDSS Luminous Red Galaxies (2007)
Okumura, Teppei, Matsubara, Takahiko, Eisenstein, Daniel J., Kayo, Issha, Hikage, Chiaki, Szalay, Alexander S., ...
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 correlation function...
The Gravitational Lensing In Redshift-Space Correlation Functions Of Galaxies And Quasars (2007)
The gravitational lensing, as well as the velocity eld and the cosmological light-cone warp, changes the observed correlation function of high-redshift objects. We present an analytical expression of...
A general formula for the correlation function in redshift space is derived in linear theory. The formula simultaneously includes wide-angle effects and cosmological distortions and thus is...
Stochasticity Of Bias And Nonlocality Of Galaxy Formation: Linear Scales (2007)
If one wants to represent the galaxy number density at some point in terms of only the mass density at the same point, there appears the stochasticity in such a relation, which is referred to as...
Statistical Perturbation Theory Of Cosmic Fields I: Basic Formalism And Second-Order Theory (2007)
We formulate a general method for perturbative evaluations of statistics of smoothed cosmic elds, which we call as \Statistical Perturbation Theory". The formalism is an extensive generalization...
Statistics Of Isodensity Contours In Redshift Space (2007)
The peculiar velocities of galaxies distort the clustering pattern anisotropically in redshift space. This effect on the statistics of isodensity contours is examined by linear theory. The statistics...
Ayako Yoshisato, Takahiko Matsubara, Masahiro Morikawa
Among various analytic approximations for the growth of density fluctuations in the expanding Universe, Zel'dovich approximation and its extensions in Lagrangian scheme are known to be accurate...
Weakly Nonlinear Evolution Of Topology Of Large-Scale Structure (2007)
The gravitational evolution of the genus and other statistics of isodensity contours of the density field is derived analytically in a weakly nonlinear regime using secondorder perturbation theory....
Diagrammatic Methods In Statistics And Biasing In The Large-Scale Structure Of The Universe (2007)
We develop technique concerning statistical analyses of the large-scale structure of the universe in the presence of biasing in the structure formation. We formulate the diagrammatic method to...
Statistics For Structure Formation In The Universe (2007)
this paper. Our approximation here is to assume that this dependence is only through the dispersion of line-of-sight velocities oe(r 1 ; : : : ; r N ) for each galaxy, and then the probability...
Resceu-32/97 Utap-267/97 (2007)
Light-Cone Effect, Takahiko Matsubara
We have evaluated a systematic effect on counts-in-cells analysis of deep, wide-field galaxy catalogues induced by the evolution of clustering within the survey volume. A multiplicative correction...
The Cosmological Constant, Takahiko Matsubara, Yasushi Suto
We propose cosmological redshift-space distortion of correlation functions of galaxies and quasars as a useful probe of both the density parameter\Omega 0 and the cosmological constant 0 . In...
Nonlinear Evolution Of Topology Of Large Scale Structure (2007)
As a statistical measure of large-scale structure of the universe, the genus number is presented in analytic form for realistic non-Gaussian distributions, i.e., weakly non-Gaussian, lognormal and...
Nonlinear Evolution Of The Genus Statistics With Zel'dovich Approximation (2007)
Naoki Seto, Takahiko Matsubara, Masaru Siino
Evolution of genus density is calculated from Gaussian initial conditions using Zel'dovich approximation. A new approach is introduced which formulates the desired quantity in a rotationally...
Redshift Space Distortions of the Correlation Function in Wide Angle Galaxy Surveys (2007)
Alexander Szalay, Takahiko Matsubara, Stephen D. Landy
Using a novel two-dimensional coordinate system, we have derived a particularly simple way to express the redshift distortions in galaxy redshift surveys with arbitrary geometry in closed form. This...
Nonlinear Evolution Of Genus In Primordial Random -- Gaussian Density Field (2007)
Takahiko Matsubara, Yasushi Suto
The genus statistics is studied using large N-body simulations for several cosmological models. We consider the effects of nonlinear gravitational evolution, smoothing the particle data in fully...
Yasushi Suto, Takahiko Matsubara
We discuss the two potentially important effects which should be taken into account in the analysis of the cosmological redshift-space distortion especially at high redshifts; the effect of...
We develop a new approach to study the nonlinear evolution in the large-scale structure of the Universe both in real space and in redshift space, extending the standard perturbation theory of...
The fifth data release of the sloan digital sky survey (2007)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The fifth data release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The Fifth Data Release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
The fifth data release of the Sloan Digital Sky Survey (2007)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through 2005 June and represents the completion of the SDSS-I...
Effects of Smoothing Functions in Cosmological Counts-in-Cells Analysis (2006)
Murata, Yoshitaka, Matsubara, Takahiko
A method of counts-in-cells analysis of galaxy distribution is investigated with arbitrary smoothing functions in obtaining the galaxy counts. We explore the possiblity of optimizing the smoothing...
Statistics of Fourier Modes in Non-Gaussian Fields (2006)
Fourier methods are fundamental tools to analyze random fields. Statistical structures of homogeneous Gaussian random fields are completely characterized by the power spectrum. In non-Gaussian random...
Hikage, Chiaki, Komatsu, Eiichiro, Matsubara, Takahiko
We derive analytical formulae for the Minkowski Functions of the cosmic microwave background (CMB) and large-scale structure (LSS) from primordial non-Gaussianity. These formulae enable us to...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The fourth data release of the sloan digital sky survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
The Fourth Data Release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
The fourth data release of the Sloan Digital Sky Survey (2006)
Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., Annis, James, ...
This paper describes the Fourth Data Release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The data release includes five-band photometric data...
Topology Analysis of the Sloan Digital Sky Survey: I. Scale and Luminosity Dependences (2005)
Park, Changbom, Choi, Yun-Young, Vogeley, Michael, Gott III, J. Richard, Kim, Juhan, Hikage, Chiaki, ...
We measure the topology of volume-limited galaxy samples selected from a parent sample of 314,050 galaxies in the Sloan Digital Sky Survey(SDSS), which is now complete enough to describe the fully...
Fourier Phase Analysis of SDSS Galaxies (2005)
Hikage, Chiaki, Matsubara, Takahiko, Suto, Yasushi, Park, Changbom, Szalay, Alexander S., Brinkmann, Jon
We present a first analysis of the clustering of SDSS galaxies using the distribution function of the sum of Fourier phases. This statistic was recently proposed by one of authors as a new method to...
The third data release of the sloan digital sky survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Third Data Release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Third Data Release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg2,...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg²,...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg²,...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg²,...
Yahata, Kazuhiro, Suto, Yasushi, Kayo, Issha, Matsubara, Takahiko, Connolly, Andrew, Berk, Daniel Vanden, ...
We report the first result of the clustering analysis of Sloan Digital Sky Survey (SDSS) quasars. We compute the two-point correlation function (2PCF) of SDSS quasars in redshift space at...
An Analysis of the Large Scale N-body Simulation using the Minkowski Functionals (2004)
Nakagami, Takamichi, Matsubara, Takahiko, Schmalzing, Jens, Jing, Yipeng
We analyze the Minkowski functionals with a large $N$-body simulation of a standard $\Lambda$CDM model, focusing on transition scales between linear and non-linear gravitational evolution. We...
Correlation Function in Deep Redshift Space as a Cosmological Probe (2004)
Recent development of galaxy surveys enables us to investigate the deep universe of high redshift. We quantitatively present the physical information extractable from the observable correlation...
Galaxy Structures and External Perturbations in Gravitational Lenses (2004)
Kawano, Yozo, Oguri, Masamune, Matsubara, Takahiko, Ikeuchi, Satoru
In modeling strong gravitational lens systems, one often adopts simple models, such as singular isothermal elliptical density plus lowest-order external perturbation. However, such simple models may...
Kayo, Issha, Suto, Yasushi, Nichol, Robert C., Pan, Jun, Szapudi, Istvan, Connolly, Andrew J., ...
We present measurements of the redshift--space three-point correlation function of galaxies in the Sloan Digital Sky Survey (SDSS). For the first time, we analyze the dependence of this statistic on...
Eigenmode Analysis of Galaxy Distributions in Redshift Space (2004)
Matsubara, Takahiko, Szalay, Alexander S., Pope, Adrian C.
Eigenmode analysis is one of the most promising methods of analyzing large data sets in ongoing and near-future galaxy surveys. In such analyses, a fast evaluation of the correlation matrix in...
Cosmological Parameters from Eigenmode Analysis of Sloan Digital Sky Survey Galaxy Redshifts (2004)
Pope, Adrian C., Matsubara, Takahiko, Szalay, Alexander S., Blanton, Michael R., Eisenstein, Daniel J., Gray, Jim, ...
We present estimates of cosmological parameters from the application of the Karhunen-Loeve transform to the analysis of the 3D power spectrum of density fluctuations using Sloan Digital Sky Survey...
The Second Data Release of the Sloan Digital sky survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Second Data Release of the Sloan Digital sky survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt, Anderson, Scott F., ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg2 of five-band (ugriz) imaging data with photometry for...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg(2) of five-band (ugriz) imaging data with photometry for...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg(2) of five-band (ugriz) imaging data with photometry for...
Hikage, Chiaki, Matsubara, Takahiko, Suto, Yasushi
We explore a signature of phase correlations in Fourier modes of dark matter density fields induced by nonlinear gravitational clustering. We compute the distribution function of the phase sum of the...
Phase Correlations in Non-Gaussian Fields (2003)
We present the general relationship between phase correlations and the hierarchy of polyspectra in the Fourier space, and the new theoretical understanding of the phase information is provided. Phase...
Apparent Clustering of Intermediate-Redshift Galaxies as a Probe of Dark Energy (2003)
Matsubara, Takahiko, Szalay, Alexander S.
4pages
Spatial Clustering of Galaxies in Large Datasets (2002)
Szalay, Alexander S., Budavari, Tamas, Connolly, Andrew, Gray, Jim, Matsubara, Takahiko, Pope, Adrian, ...
Datasets with tens of millions of galaxies present new challenges for the analysis of spatial clustering. We have built a framework that integrates a database of object catalogs, tools for creating...
Apparent Clustering of Intermediate-redshift Galaxies as a Probe of Dark Energy (2002)
Matsubara, Takahiko, Szalay, Alexander S.
We show the apparent redshift-space clustering of galaxies in redshift range of 0.2--0.4 provides surprisingly useful constraints on dark energy component in the universe, because of the right...
Three-Dimensional Genus Statistics of Galaxies in the SDSS Early Data Release (2002)
Hikage, Chiaki, Suto, Yasushi, Kayo, Issha, Taruya, Atsushi, Matsubara, Takahiko, Vogeley, Michael S., ...
We present the first analysis of three-dimensional genus statistics for the SDSS EDR galaxy sample. Due to the complicated survey volume and the selection function, analytic predictions of the genus...
Cosmological Parameters from Redshift-Space Correlations (2002)
Matsubara, Takahiko, Szalay, Alexander S.
We estimate how clustering in large-scale redshift surveys can constrain various cosmological parameters. Depth and sky coverage of modern redshift surveys are greater than ever, opening new...
Collaboration, SDSS, Szalay, Alexander S., Jain, Bhuvnesh, Matsubara, Takahiko, Scranton, Ryan, Vogeley, Michael S., ...
We present measurements of parameters of the 3-dimensional power spectrum of galaxy clustering from 222 square degrees of early imaging data in the Sloan Digital Sky Survey. The projected galaxy...
Constraining the Cosmological Constant from Large-Scale Redshift-Space Clustering (2001)
Matsubara, Takahiko, Szalay, Alexander S.
We show how the cosmological constant can be estimated from redshift surveys at different redshifts, using maximum-likelihood techniques. The apparent redshift-space clustering on large scales...
The Topology of Weak Lensing Fields (2000)
Matsubara, Takahiko, Jain, Bhuvnesh
The topology of weak lensing fields is studied using the 2-dimensional genus statistic. Simulated fields of the weak lensing convergence are used to focus on the effect of nonlinear gravitional...
We formulate a general method for perturbative evaluations of statistics of smoothed cosmic fields, and provide useful formulas in application of the perturbation theory to various statistics. This...
The Gravitational Lensing in Redshift-space Correlation Functions of Galaxies and Quasars (2000)
The gravitational lensing, as well as the velocity field and the cosmological light-cone warp, changes the observed correlation function of high-redshift objects. We present an analytical expression...
Cosmological Parameters from the Eigenmode Analysis of the Las Campanas Redshift Survey (1999)
Matsubara, Takahiko, Szalay, Alexander S., Landy, Stephen D.
We present the first results of the Karhunen-Lo\`eve (KL) eigenmodes applied to real data of the Las Campanas Redshift Survey (LCRS) to simultaneously measure the values of the redshift-distortion...
A general formula for the correlation function in redshift space is derived in linear theory. The formula simultaneously includes wide-angle effects and cosmological distortions. The formula is...
Stochasticity of Bias and Nonlocality of Galaxy Formation: Linear Scales (1999)
If one wants to represent the galaxy number density at some point in terms of only the mass density at the same point, there appears the stochasticity in such a relation, which is referred to as...
Suto, Yasushi, Magira, Hiromitsu, Jing, Y. P., Matsubara, Takahiko, Yamamoto, Kazuhiro
The three-dimensional distribution of astronomical objects observed in redshift space significantly differs from the true distribution since the distance to each object cannot be determined by its...
Yasushi Suto, Hiromitsu Magira, Y. P. Jing, Takahiko Matsubara, Kazuhiro Yamamoto
This paper consists of two topics which should play key roles in the theoretical interpretation of the future redshift surveys of high-redshift objects, the cosmological light-cone effect (x2) and...
Redshift Space Distortions of the Correlation Function in Wide Angle Galaxy Surveys (1997)
Szalay, Alexander S., Matsubara, Takahiko, Landy, Stephen D.
Using a novel two-dimensional coordinate system, we have derived a particularly simple way to express the redshift distortions in galaxy redshift surveys with arbitrary geometry in closed form. This...
Matsubara, Takahiko, Yoshisato, Ayako, Morikawa, Masahiro
Among several analytic approximations for the growth of density fluctuations in the expanding Universe, Zel'dovich approximation in Lagrangian coordinate scheme is known to be unusually accurate even...
Light-cone effect on higher-order clustering in redshift surveys (1997)
Matsubara, Takahiko, Suto, Yasushi, Szapudi, Istvan
We have evaluated a systematic effect on counts-in-cells analysis of deep, wide-field galaxy catalogues induced by the evolution of clustering within the survey volume. A multiplicative correction...
Yoshisato, Ayako, Matsubara, Takahiko, Morikawa, Masahiro
Among various analytic approximations for the growth of density fluctuations in the expanding Universe, Zel'dovich approximation and its extensions in Lagrangian scheme are known to be accurate even...
Nakamura, Takahiro T., Matsubara, Takahiko, Suto, Yasushi
The observed two-point correlation functions of galaxies in redshift space become anisotropic due to the geometry of the universe as well as due to the presence of the peculiar velocity field. On the...
Nonlinear Evolution of the Genus Statistics with Zel'dovich Approximation (1996)
Seto, Naoki, Yokoyama, Jun'ichi, Matsubara, Takahiko, Siino, Masaru
Evolution of genus density is calculated from Gaussian initial conditions using Zel'dovich approximation. A new approach is introduced which formulates the desired quantity in a rotationally...
Suto, Yasushi, Matsubara, Takahiko
We discuss the two potentially important effects which should be taken into account in the analysis of the cosmological redshift-space distortion especially at high redshifts; the effect of...
Matsubara, Takahiko, Suto, Yasushi
We propose cosmological redshift-space distortion of correlation functions of galaxies and quasars as a probe of both the density parameter $\Omega_0$ and the cosmological constant $\lambda_0$. In...
The Eulerian and Lagrangian second-order perturbation theories are solved explicitly in closed forms in $\Omega \neq 1$ and $\Lambda \neq 0$ {}Friedmann-Lema\^{\i}tre models. I explicitly write the...
Nonlinear Evolution of Genus in Primordial Random-Gaussian Density Field (1995)
Matsubara, Takahiko, Suto, Yasushi
The genus statistics is studied using large $N$-body simulations for several cosmological models. We consider the effects of nonlinear gravitational evolution, smoothing the particle data in fully...
Genus Statistics of the Large-Scale Structure with Non-Gaussian Density Fields (1995)
Matsubara, Takahiko, Yokoyama, Jun'ichi
As a statistical measure to quantify the topological structure of the large-scale structure in the universe, the genus number is calculated for a number of non-Gaussian distributions in which the...
Weakly Nonlinear Evolution of Topology of Large-scale Structure (1995)
The gravitational evolution of the genus and other statistics of isodensity contours of the density field is derived analytically in a weakly nonlinear regime using second-order perturbation theory....
Statistics of Isodensity Contours in Redshift Space (1995)
The peculiar velocities of galaxies distort the clustering pattern anisotropically in redshift space. This effect on the statistics of isodensity contours is examined by linear theory. The statistics...
Diagrammatic Methods in Statistics and Biasing in the Large-scale Structure of the Universe (1995)
We develop technique concerning statistical analyses of the large-scale structure of the universe in the presence of biasing in the structure formation. We formulate the diagrammatic method to...
Genus Statistics of the Large-Scale Structure with Non-Gaussian Density Fields (1995)
Takahiko Matsubara, Jun'ichi Yokoyama
As a statistical measure to quantify the topological structure of the large-scale structure in the universe, the genus number is calculated for a number of non-Gaussian distributions in which the...
松原,隆彦, マツバラ,タカヒコ, Matsubara,Takahiko
講義の目的：宇宙論は、この宇宙全体がどのようにはじまり、どのように進化するのか、そもそも宇宙とはなにものなのかを明らかにしようとする...