Neyrinck, Mark C., Szapudi, István, Szalay, Alexander S.
We find that nonlinearities in the dark-matter power spectrum are dramatically smaller if the density field first undergoes a logarithmic mapping. In the Millennium simulation, this procedure...
A Map of the Integrated Sachs-Wolfe Signal from Luminous Red Galaxies (2008)
Granett, Benjamin R., Neyrinck, Mark C., Szapudi, István
We construct a map of the derivative of the gravitational potential traced by SDSS Luminous Red Galaxies. The potential decays on large scales due to cosmic acceleration, leaving an imprint on...
Granett, Benjamin R., Neyrinck, Mark C., Szapudi, István
We measure hot and cold spots on the microwave background associated with supercluster and supervoid structures identified in the Sloan Digital Sky Survey Luminous Red Galaxy catalog. The structures...
Dark Energy Detected with Supervoids and Superclusters (2008)
Granett, Benjamin R., Neyrinck, Mark C., Szapudi, István
The observed apparent acceleration of the universe is usually attributed to negative pressure from a mysterious dark energy. This acceleration causes the gravitational potential to decay, heating or...
ZOBOV: a parameter-free void-finding algorithm (2007)
ZOBOV (ZOnes Bordering On Voidness) is an algorithm that finds density depressions in a set of points, without any free parameters, or assumptions about shape. It uses the Voronoi tessellation to...
Baryon oscillations in galaxy and matter power-spectrum covariance matrices (2007)
Neyrinck, Mark C., Szapudi, István
We investigate large-amplitude baryon acoustic oscillations (BAO's) in off-diagonal entries of cosmological power-spectrum covariance matrices. These covariance-matrix BAO's describe the increased...
Neyrinck, Mark C., Szapudi, István
We investigate the cosmological Fisher information in the non-linear dark-matter power spectrum in the context of the halo model. We find that there is a plateau in information content on translinear...
Information content in the halo-model dark-matter power spectrum (2006)
Neyrinck, Mark C., Szapudi, István, Rimes, Christopher D.
Using the halo model, we investigate the cosmological Fisher information in the non-linear dark-matter power spectrum about the initial amplitude of linear power. We find that there is little...
A galaxy-halo model of large-scale structure (2005)
Neyrinck, Mark C., Hamilton, Andrew J. S., Gnedin, Nickolay Y.
We present a new, galaxy-halo model of large-scale structure, in which the galaxies entering a given sample are the fundamental objects. Haloes attach to galaxies, in contrast to the standard halo...
VOBOZ: An Almost-Parameter-Free Halo-Finding Algorithm (2004)
Neyrinck, Mark C., Gnedin, Nickolay Y., Hamilton, Andrew J. S.
We have developed an algorithm to find haloes in an N-body dark matter simulation, called VOBOZ (VOronoi BOund Zones), which has as little dependence on free parameters as we can manage. By using the...
Understanding the PSCz Galaxy Power Spectrum with N-body Simulations (2003)
Neyrinck, Mark C., Hamilton, Andrew J. S., Gnedin, Nickolay Y.
By comparing the PSCz galaxy power spectrum with the results of nested pure dark matter N-body simulations, we try to understand how infrared-selected galaxies populate dark-matter haloes, paying...
The PSCz Galaxy Power Spectrum Compared to N-Body Simulations (2003)
Neyrinck, Mark C., Hamilton, Andrew J. S., Gnedin, Nickolay Y.
By comparing the PSCz galaxy power spectrum with haloes from nested and phased N-body simulations, we try to understand how IRAS infrared-selected galaxies populate dark-matter haloes. We pay special...
Linear Gas Dynamics in the Expanding Universe: Why the Jeans Scale does not Matter (2002)
Gnedin, Nickolay Y., Baker, Emily J., Bethell, Thomas J., Drosback, Meredith M., Harford, A. Gayler, Hicks, Amalia K., ...
We investigate the relationship between the dark matter and baryons in the linear regime. This relation is quantified by the so-called ``filtering scale''. We show that a simple gaussian ansatz which...