The Baryonic Acoustic Feature and Large-Scale Clustering in the SDSS LRG Sample (2009)
Kazin, Eyal A., Blanton, Michael R., Scoccimarro, Roman, McBride, Cameron K., Berlind, Andreas A., Bahcall, Neta A., ...
We examine the correlation function \xi of the Sloan Digital Sky Survey (SDSS) Luminous Red Galaxy sample (LRG) at large scales (60
Large-Scale Structure in Brane-Induced Gravity I. Perturbation Theory (2009)
We study the growth of subhorizon perturbations in brane-induced gravity using perturbation theory. We solve for the linear evolution of perturbations taking advantage of the symmetry under gauge...
Large-Scale Structure in Brane-Induced Gravity II. Numerical Simulations (2009)
Chan, K. C., Scoccimarro, Roman
We use N-body simulations to study the nonlinear structure formation in brane-induced gravity, developing a new method that requires alternate use of Fast Fourier Transforms and relaxation. This...
Large scale bias and the inaccuracy of the peak-background split (2009)
Manera, Marc, Sheth, Ravi K, Scoccimarro, Roman
The peak-background split argument is commonly used to relate the abundance of dark matter halos to their spatial clustering. Testing this argument requires an accurate determination of the halo mass...
Generation of Vorticity and Velocity Dispersion by Orbit Crossing (2008)
Pueblas, Sebastian, Scoccimarro, Roman
We study the generation of vorticity and velocity dispersion by orbit crossing using cosmological numerical simulations, and calculate the backreaction of these effects on the evolution of...
Multi-Point Propagators in Cosmological Gravitational Instability (2008)
Bernardeau, Francis, Crocce, Martin, Scoccimarro, Roman
We introduce the concept of multi-point propagators between linear cosmic fields and their nonlinear counterparts in the context of cosmological perturbation theory. Such functions express how a...
An analytic model for the bispectrum of galaxies in redshift space (2007)
Smith, Robert E., Sheth, Ravi K., Scoccimarro, Roman
We develop an analytic theory for the redshift space bispectrum of dark matter, haloes and galaxies. This is done within the context of the halo model of structure formation, as this allows for the...
`Eppur Si Muove': On The Motion of the Acoustic Peak in the Correlation Function (2007)
Smith, Robert E., Scoccimarro, Roman, Sheth, Ravi K.
The baryonic acoustic signature in the large-scale clustering pattern of galaxies has been detected in the two-point correlation function. Its precise spatial scale has been forwarded as a rigid-rod...
Cosmological constraints from the SDSS luminous red galaxies (2006)
Tegmark, Max, Eisenstein, Daniel J., Strauss, Michael A., Weinberg, David H., Blanton, Michael R., Frieman, Joshua A., ...
We measure the large-scale real-space power spectrum P(k) using luminous red galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS) and use this measurement to sharpen constraints on cosmological...
Cosmological constraints from the SDSS Luminous Red Galaxies (2006)
Tegmark, Max, Eisenstein, Daniel, Strauss, Michael, Weinberg, David, Blanton, Michael, Frieman, Joshua, ...
Also archived in: arXiv:astro-ph/0608632 v2 Oct 30 2006
The Clustering of Galaxy Groups: Dependence on Mass and Other Properties (2006)
Berlind, Andreas A., Kazin, Eyal, Blanton, Michael R., Pueblas, Sebastian, Scoccimarro, Roman, Hogg, David W.
We investigate the clustering of galaxy groups and clusters in the SDSS using the Berlind et al. (2006) group sample, which is designed to identify galaxy systems that each occupy a single dark...
The Scale Dependence of Halo and Galaxy Bias: Effects in Real Space (2006)
Smith, Robert E., Scoccimarro, Roman, Sheth, Ravi K.
We examine the scale dependence of dark matter, halo and galaxy clustering on very large scales (0.01
Cosmology and the Bispectrum (2006)
Sefusatti, Emiliano, Crocce, Martin, Pueblas, Sebastian, Scoccimarro, Roman
The present spatial distribution of galaxies in the Universe is non-Gaussian, with 40% skewness in 50 Mpc/h spheres, and remarkably little is known about the information encoded in it about...
Berlind, Andreas A., Frieman, Joshua A., Weinberg, David H., Blanton, Michael R., Warren, Michael S., Abazajian, Kevork, ...
We identify galaxy groups and clusters in volume-limited samples of the SDSS redshift survey, using a redshift-space friends-of-friends algorithm. We optimize the friends-of-friends linking lengths...
Eisenstein, Daniel, Zehavi, Idit, Hogg, David, Scoccimarro, Roman, Blanton, Michael, Nichol, Robert, ...
Also archived in: arXiv:astro-ph/0501171 v1 10 Jan 2005
Eisenstein, Daniel, Zehavi, Idit, Hogg, David, Scoccimarro, Roman, Blanton, Michael, Nichol, Robert, ...
Also archived in: arXiv:astro-ph/0501171 v1 10 Jan 2005
Eisenstein, Daniel J., Zehavi, Idit, Hogg, David W., Scoccimarro, Roman, Blanton, Michael R., Nichol, Robert C., ...
Abstract not available.
Eisenstein, Daniel J., Zehavi, Idit, Hogg, David W., Scoccimarro, Roman, Blanton, Michael R., Nichol, Robert C., ...
Abstract not available.
Eisenstein, Daniel J., Zehavi, Idit, Hogg, David W., Scoccimarro, Roman, Blanton, Michael R., Nichol, Robert C., ...
Abstract not available.
Galaxy Bias and Halo-Occupation Numbers from Large-Scale Clustering (2004)
Sefusatti, Emiliano, Scoccimarro, Roman
We show that current surveys have at least as much signal to noise in higher-order statistics as in the power spectrum at weakly nonlinear scales. We discuss how one can use this information to...
Redshift-Space Distortions, Pairwise Velocities and Nonlinearities (2004)
We derive the exact relationship, including all non-linearities, between real-space and redshift-space two-point statistics through the pairwise velocity distribution function. We show using...
Lue, Arthur, Scoccimarro, Roman, Starkman, Glenn D.
The nature of the fuel that drives today's cosmic acceleration is an open and tantalizing mystery. The braneworld theory of Dvali, Gabadadze, and Porrati (DGP) provides a context where late-time...
Probing Primordial Non-Gaussianity with Large-Scale Structure (2003)
Scoccimarro, Roman, Sefusatti, Emiliano, Zaldarriaga, Matias
We consider primordial non-Gaussianity due to quadratic corrections in the gravitational potential parametrized by a non-linear coupling parameter fnl. We study constraints on fnl from measurements...
Differentiating between Modified Gravity and Dark Energy (2003)
Lue, Arthur, Scoccimarro, Roman, Starkman, Glenn
The nature of the fuel that drives today's cosmic acceleration is an open and tantalizing mystery. We entertain the suggestion that the acceleration is not the manifestation of yet another new...
On Departures From a Power Law in the Galaxy Correlation Function (2003)
Zehavi, Idit, Weinberg, David H., Zheng, Zheng, Berlind, Andreas A., Frieman, Joshua A., Scoccimarro, Roman, ...
We measure the projected correlation function w_p(r_p) from the Sloan Digital Sky Survey for a flux-limited sample of 118,000 galaxies and for a volume limited subset of 22,000 galaxies with absolute...
Higher-order moments of the lensing shear and other spin two fields (2002)
Zaldarriaga, Matias, Scoccimarro, Roman
We present a method for defining higher-order moments of a spin-2 field on the sky using the transformation properties of these statistics under rotation and parity. For the three-point function of...
How Neutral is the Intergalactic Medium at z ~ 6? (2001)
Lidz, Adam, Hui, Lam, Zaldarriaga, Matias, Scoccimarro, Roman
Recent observations of high redshift quasar spectra reveal long gaps with little flux. A small or no detectable flux does not by itself imply the intergalactic medium (IGM) is neutral. Inferring the...
Inferring the Linear Power Spectrum from the Lyman-alpha Forest (2001)
Zaldarriaga, Matias, Scoccimarro, Roman, Hui, Lam
We discuss the determination of the linear power spectrum of dark matter fluctuations from measurements of the transmitted flux Ly-alpha Forest power spectrum. We show that at most scales probed by...
Higher Order Moments of the Angular Distribution of Galaxies from Early SDSS Data (2001)
Szapudi, István, Frieman, Joshua A., Scoccimarro, Roman, Szalay, Alexander S., Connolly, Andrew J., Dodelson, Scott, ...
We present initial results for counts in cells statistics of the angular distribution of galaxies in early data from the Sloan Digital Sky Survey (SDSS). We analyze a rectangular stripe $2.5^\circ$...
Collaboration, SDSS, Scranton, Ryan, Johnston, David, Dodelson, Scott, Frieman, Joshua A., Connolly, Andy, ...
The angular distribution of galaxies encodes a wealth of information about large scale structure. Ultimately, the Sloan Digital Sky Survey (SDSS) will record the angular positions of order 10^8...
The Angular Correlation Function of Galaxies from Early SDSS Data (2001)
Collaboration, SDSS, Connolly, Andrew, Scranton, Ryan, Johnston, David, Dodelson, Scott, Eisenstein, Daniel, ...
The Sloan Digital Sky Survey is one of the first multicolor photometric and spectroscopic surveys designed to measure the statistical properties of galaxies within the local Universe. In this Letter...
The Angular Power Spectrum of Galaxies from Early SDSS Data (2001)
Collaboration, SDSS, Tegmark, Max, Dodelson, Scott, Eisenstein, Daniel, Narayanan, Vijay, Scoccimarro, Roman, ...
We compute the angular power spectrum C_l from 1.5 million galaxies in early SDSS data on large angular scales, l
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...
The 3D Power Spectrum from Angular Clustering of Galaxies in Early SDSS Data (2001)
Dodelson, Scott, Narayanan, Vijay K., Tegmark, Max, Scranton, Ryan, Budavari, Tamas, Connolly, Andrew, ...
Early photometric data from the Sloan Digital Sky Survey (SDSS) contain angular positions for 1.5 million galaxies. In companion papers, the angular correlation function $w(\theta)$ and 2D power...
PTHalos: A fast method for generating mock galaxy distributions (2001)
Scoccimarro, Roman, Sheth, Ravi K.
Current models of galaxy formation applied to understanding the large-scale structure of the universe have two parts. The first is an accurate solution of the equations of motion for the dark matter...
Feldman, Hume A., Frieman, Joshua A., Fry, J. N., Scoccimarro, Roman
We compute the bispectrum for the \IRAS PSCz catalog and find that the galaxy distribution displays the characteristic signature of gravity. Assuming Gaussian initial conditions, we obtain galaxy...
On the streaming motions of haloes and galaxies (2000)
Sheth, Ravi K., Diaferio, Antonaldo, Hui, Lam, Scoccimarro, Roman
A simple model of how objects of different masses stream towards each other as they cluster gravitationally is described. The model shows how the mean streaming velocity of dark matter particles is...
A Fitting Formula for the Non-Linear Evolution of the Bispectrum (2000)
Scoccimarro, Roman, Couchman, H. M. P.
We present a fitting formula for the non-linear evolution of the bispectrum in CDM models, obtained from measurements in high resolution numerical simulations. The formula interpolates between the...
Linear and nonlinear contributions to pairwise peculiar velocities (2000)
Sheth, Ravi K., Hui, Lam, Diaferio, Antonaldo, Scoccimarro, Roman
We write the correlation function of dark matter particles, xi(r), as the sum of two terms - one which accounts for nonlinear evolution, and dominates on small scales, and another which is...
A New Angle on Gravitational Clustering (2000)
We describe a new approach to gravitational instability in large-scale structure, where the equations of motion are written and solved as in field theory in terms of Feynman diagrams. The basic...
Scoccimarro, Roman, Sheth, Ravi K., Hui, Lam, Jain, Bhuvnesh
We study galaxy clustering using halo models, where gravitational clustering is described in terms of dark matter halos. At small scales, clustering statistics are dominated by halo density profiles,...
The Bispectrum: From Theory to Observations (2000)
The bispectrum is the lowest-order statistic sensitive to the shape of structures generated by gravitational instability and is a potentially powerful probe of galaxy biasing and the Gaussianity of...
Gravitational Clustering from Chi^2 Initial Conditions (2000)
We consider gravitational clustering from primoridal non-Gaussian fluctuations provided by a $\chi^2$ model, as motivated by some models of inflation. The emphasis is in signatures that can be used...
Power Spectrum Correlations Induced by Non-Linear Clustering (1999)
Scoccimarro, Roman, Zaldarriaga, Matias, Hui, Lam
Gravitational clustering is an intrinsically non-linear process that generates significant non-Gaussian signatures in the density field. We consider how these affect power spectrum determinations...
Hyperextended Cosmological Perturbation Theory: Predicting Non-linear Clustering Amplitudes (1998)
Scoccimarro, Roman, Frieman, Joshua A.
We consider the long-standing problem of predicting the hierarchical clustering amplitudes $S_p$ in the strongly non-linear regime of gravitational evolution. N-body results for the non-linear...
The Bispectrum as a Signature of Gravitational Instability in Redshift-Space (1998)
Scoccimarro, Roman, Couchman, H. M. P., Frieman, Joshua A.
The bispectrum provides a characteristic signature of gravitational instability that can be used to probe the Gaussianity of the initial conditions and the bias of the galaxy distribution. We study...
Redshift Distortions: Perturbative and N-body Results (1998)
I discuss the evolution of the redshift-space bispectrum via perturbation theory (PT) and large high-resolution numerical simulations. At large scales, we give the multipole expansion of the...
The Impact of Inhomogeneous Reionization on Cosmic Microwave Background Anisotropy (1998)
Knox, Lloyd, Scoccimarro, Roman, Dodelson, Scott
Hydrogen atoms in the Universe that initially formed at redshift z = 1100 were reionized at 5 < z < 60. It is likely that this transition proceeded through a mixed phase of partial ionization. We...
Transients from Initial Conditions: A Perturbative Analysis (1997)
The standard procedure to generate initial conditions (IC) in numerical simulations is to use the Zel'dovich approximation (ZA). Although the ZA correctly reproduces the linear growing modes of...
Non-Linear Evolution of the Bispectrum of Cosmological Perturbations (1997)
Scoccimarro, Roman, Colombi, Stephane, Fry, J. N., Frieman, Joshua A., Hivon, Eric, Melott, Adrian
The bispectrum, the three-point function of density fluctuations in Fourier space, is the lowest order statistic that carries information about the spatial coherence of large-scale structures. For...
Understanding Gravitational Clustering with Non-Linear Perturbation Theory (1997)
I discuss new results concerning the evolution of the bispectrum due to gravitational instability from gaussian initial conditions using one-loop perturbation theory (PT). Particular attention is...
Cosmological Perturbations: Entering the Non-Linear Regime (1996)
We consider one-loop corrections to the bispectrum and skewness of cosmological density fluctuations induced by gravitational evolution. As has been established by comparison with numerical...
Scoccimarro, Roman, Frieman, Josh
We calculate the lowest-order non-linear contributions to the power spectrum, two-point correlation function, and smoothed variance of the density field, for Gaussian initial conditions and...
Loop Corrections in Non-Linear Cosmological Perturbation Theory (1995)
Scoccimarro, Roman, Frieman, Joshua
Using a diagrammatic approach to Eulerian perturbation theory, we analytically calculate the variance and skewness of the density and velocity divergence induced by gravitational evolution from...