The Case for Deep, Wide-Field Cosmology (2009)
Scranton, Ryan, Albrecht, Andreas, Caldwell, Robert, Cooray, Asantha, Dore, Olivier, Habib, Salman, ...
Much of the science case for the next generation of deep, wide-field optical/infrared surveys has been driven by the further study of dark energy. This is a laudable goal (and the subject of a...
Exploring Dark Energy with Next-Generation Photometric Redshift Surveys (2009)
Zhan, Hu, Albrecht, Andreas, Cooray, Asantha, Habib, Salman, Heavens, Alan, Heitmann, Katrin, ...
The coming decade will be an exciting period for dark energy research, during which astronomers will address the question of what drives the accelerated cosmic expansion as first revealed by type Ia...
Heitmann, Katrin, Higdon, David, White, Martin, Habib, Salman, Williams, Brian J., Wagner, Christian
The power spectrum of density fluctuations is a foundational source of cosmological information. Precision cosmological probes targeted primarily at investigations of dark energy require accurate...
The Coyote Universe I: Precision Determination of the Nonlinear Matter Power Spectrum (2008)
Heitmann, Katrin, White, Martin, Wagner, Christian, Habib, Salman, Higdon, David
Near-future cosmological observations targeted at investigations of dark energy pose stringent requirements on the accuracy of theoretical predictions for the clustering of matter. Currently, N-body...
Schneider, Michael D., Knox, Lloyd, Habib, Salman, Heitmann, Katrin, Higdon, David, Nakhleh, Charles
We describe an approximate statistical model for the sample variance distribution of the non-linear matter power spectrum that can be calibrated from limited numbers of simulations. Our model retains...
X-ray Observations of Optically Selected Giant Elliptical-Dominated Galaxy Groups (2008)
Voevodkin, Alexey, Miller, Christopher J., Borozdin, Konstantin, Heitmann, Katrin, Habib, Salman, Ricker, Paul, ...
We present a combined optical and X-ray analysis of three optically selected X-ray bright groups with giant elliptical galaxies in the center. These massive ellipticals were targeted for XMM-Newton...
The Structure of Halos: Implications for Group and Cluster Cosmology (2008)
Lukić, Zarija, Reed, Darren, Habib, Salman, Heitmann, Katrin
The dark matter halo mass function is a key repository of cosmological information over a wide range of mass scales, from individual galaxies to galaxy clusters. N-body simulations have established...
Multiple Uncertainties in Time-Variant Cosmological Particle Data (2008)
Haroz, Steve, Ma, Dr. Kwan-Liu, Heitmann, Dr. Katrin
Though the mediums for visualization are limited, the potential dimensions of a dataset are not. In many areas of scientific study, understanding the correlations between those dimensions and their...
Multiple Uncertainties in Time-Variant Cosmological Particle Data (2008)
Haroz, Steve, Ma, Dr. Kwan-Liu, Heitmann, Dr. Katrin
Though the mediums for visualization are limited, the potential dimensions of a dataset are not. In many areas of scientific study, understanding the correlations between those dimensions and their...
Multiple Uncertainties in Time-Variant Cosmological Particle Data (2008)
Haroz, Steve, Ma, Kwan-Liu, Heitmann, Katrin
Though the mediums for visualization are limited, the potential dimensions of a dataset are not. In many areas of scientific study, understanding the correlations between those dimensions and their...
Evrard, August E., Bialek, James, Busha, Michael T., White, Martin, Habib, Salman, Heitmann, Katrin, ...
Abstract not available.
Evrard, August E., Bialek, James, Busha, Michael T., White, Martin, Habib, Salman, Heitmann, Katrin, ...
Abstract not available.
Evrard, August E., Bialek, James, Busha, Michael T., White, Martin, Habib, Salman, Heitmann, Katrin, ...
Abstract not available.
Evrard, August E., Bialek, James, Busha, Michael T., White, Martin, Habib, Salman, Heitmann, Katrin, ...
Abstract not available.
Evrard, August E., Bialek, James, Busha, Michael T., White, Martin, Habib, Salman, Heitmann, Katrin, ...
Abstract not available.
The Cosmic Code Comparison Project (2007)
Heitmann, Katrin, Lukic, Zarija, Fasel, Patricia, Habib, Salman, Warren, Michael S., White, Martin, ...
Current and upcoming cosmological observations allow us to probe structures on smaller and smaller scales, entering highly nonlinear regimes. In order to obtain theoretical predictions in these...
The Halo Mass Function: High-Redshift Evolution and Universality (2007)
Lukic, Zarija, Heitmann, Katrin, Habib, Salman, Bashinsky, Sergei, Ricker, Paul M.
We study the formation of dark matter halos in the concordance LCDM model over a wide range of redshifts, from z=20 to the present. Our primary focus is the halo mass function, a key probe of...
Habib, Salman, Heitmann, Katrin, Higdon, David, Nakhleh, Charles, Williams, Brian
Several cosmological measurements have attained significant levels of maturity and accuracy over the last decade. Continuing this trend, future observations promise measurements of the statistics of...
Heitmann, Katrin, Higdon, David, Nakhleh, Charles, Habib, Salman
The complexity and accuracy of current and future precision cosmology observational campaigns has made it essential to develop an efficient technique for directly combining simulation and...
Capturing Halos at High Redshifts (2006)
Heitmann, Katrin, Lukic, Zarija, Habib, Salman, Ricker, Paul M.
We study the evolution of the mass function of dark matter halos in the concordance LCDM model at high redshift. We employ overlapping (multiple-realization) numerical simulations to cover a wide...
Nonequilibrium and Nonlinear Dynamics in Geomaterials I : The Low Strain Regime (2006)
Pasqualini, Donatella, Heitmann, Katrin, TenCate, James A., Habib, Salman, Higdon, David, Johnson, Paul A.
Members of a wide class of geomaterials are known to display complex and fascinating nonlinear and nonequilibrium dynamical behaviors over a wide range of bulk strains, down to surprisingly low...
Shapes and Sizes of Voids in the LCDM Universe: Excursion Set Approach (2005)
Shandarin, Sergei, Feldman, Hume A., Heitmann, Katrin, Habib, Salman
We study the global distribution and morphology of dark matter voids in a LCDM universe using density fields generated by N-body simulations. Voids are defined as isolated regions of the low-density...
Crotts, Arlin, Garnavich, Peter, Priedhorsky, William, Habib, Salman, Heitmann, Katrin, Wang, Yun, ...
JEDI will probe dark energy in three independent ways by measuring the expansion history of the universe: (1) using type Ia supernovae as cosmological standard candles over a range of distances, (2)...
Lidz, Adam, Heitmann, Katrin, Hui, Lam, Habib, Salman, Rauch, Michael, Sargent, Wallace L. W.
The analysis of the Lyman-alpha forest of absorption lines in quasar spectra has emerged as a potentially powerful technique to constrain the linear matter power spectrum. In most previous work, the...
Inflationary Perturbations and Precision Cosmology (2005)
Habib, Salman, Heinen, Andreas, Heitmann, Katrin, Jungman, Gerard
Inflationary cosmology provides a natural mechanism for the generation of primordial perturbations which seed the formation of observed cosmic structure and lead to specific signals of anisotropy in...
Robustness of Cosmological Simulations I: Large Scale Structure (2004)
Heitmann, Katrin, Ricker, Paul M., Warren, Michael S., Habib, Salman
The gravitationally-driven evolution of cold dark matter dominates the formation of structure in the Universe over a wide range of length scales. While the longest scales can be treated by...
The Nonlinear Cosmological Matter Power Spectrum with Massive Neutrinos I: The Halo Model (2004)
Abazajian, Kevork, Switzer, Eric R., Dodelson, Scott, Heitmann, Katrin, Habib, Salman
Measurements of the linear power spectrum of galaxies have placed tight constraints on neutrino masses. We extend the framework of the halo model of cosmological nonlinear matter clustering to...
Inverse-Scattering Theory and the Density Perturbations from Inflation (2004)
Habib, Salman, Heitmann, Katrin, Jungman, Gerard
Inflationary cosmology provides a successful paradigm for solving several problems, notably the generation of density perturbations which seed the formation of observed cosmic structure. We show how...
Characterizing Inflationary Perturbations: The Uniform Approximation (2004)
Habib, Salman, Heinen, Andreas, Heitmann, Katrin, Jungman, Gerard, Molina-Paris, Carmen
The spectrum of primordial fluctuations from inflation can be obtained using a mathematically controlled, and systematically extendable, uniform approximation. Closed-form expressions for power...
Nonlinear and Nonequilibrium Dynamics in Geomaterials (2004)
TenCate, James A., Pasqualini, Donatella, Habib, Salman, Heitmann, Katrin, Higdon, David, Johnson, Paul A.
The transition from linear to nonlinear dynamical elasticity in rocks is of considerable interest in seismic wave propagation as well as in understanding the basic dynamical processes in consolidated...
The Inflationary Perturbation Spectrum (2002)
Habib, Salman, Heitmann, Katrin, Jungman, Gerard, Molina-Paris, Carmen
Motivated by the prospect of testing inflation from precision cosmic microwave background observations, we present analytic results for scalar and tensor perturbations in single-field inflation...
Dynamics of coupled bosonic systems with applications to preheating (2001)
Cormier, Daniel, Heitmann, Katrin, Mazumdar, Anupam
Coupled, multi-field models of inflation can provide several attractive features unavailable in the case of a single inflaton field. These models have a rich dynamical structure resulting from the...
Gauge Fields Out-Of-Equilibrium: A Gauge Invariant Formulation and the Coulomb Gauge (2001)
We study the abelian Higgs model out-of-equilibrium in two different approaches, a gauge invariant formulation, proposed by Boyanovsky et al. \cite{Boyanovsky:1996dc} and in the Coulomb gauge. We...
Non-equilibrium dynamics of symmetry breaking and gauge fields in quantum field theory (2000)
Die vorliegende Arbeit beschäftigt sich mit Nichtgleichgewichtssystemen in der Quantenfeldtheorie. Im ersten Teil wird als einfaches Modell die Phi 4 Theorie untersucht. Es werden verschiedene...
Nonequilibrium dynamics of fermions in a spatially homogeneous scalar background field (1998)
Baacke, Juergen, Heitmann, Katrin, Patzold, Carsten
We consider the time evolution of systems in which a spatially homogeneous scalar field is coupled to fermions. The quantum back-reaction is taken into account in one-loop approximation. We set up...
Renormalization of nonequilibrium dynamics at large N and finite temperature (1997)
Baacke, Juergen, Heitmann, Katrin, Patzold, Carsten
We generalize a previously proposed renormalization and computation scheme for nonequilibrium dynamics to include finite temperature and one-loop selfconsistency as arising in the large-N limit....
On the choice of initial states in nonequilibrium dynamics (1997)
Baacke, Juergen, Heitmann, Katrin, Patzold, Carsten
Imposing initial conditions to nonequilibrium systems at some time t_0 leads, in renormalized quantum field theory, to the appearance of singularities in the variable t-t_0 in relevant physical...
Renormalization of nonequilibrium dynamics in FRW cosmology (1997)
Baacke, Jurgen, Heitmann, Katrin, Patzold, Carsten
We derive the renormalized nonequilibrium equations of motion for a scalar field and its quantum back reaction in a conformally flat Friedmann-Robertson-Walker universe. We use a fully covariant...
Nonequilibrium dynamics: preheating in the SU(2) Higgs model (1996)
Baacke, Juergen, Heitmann, Katrin, Paetzold, Carsten
The term `preheating' has been introduced recently to denote the process in which energy is transferred from a classical inflaton field into fluctuating field (particle) degrees of freedom without...
Nonequilibrium dynamics: a renormalized computation scheme (1996)
Baacke, Juergen, Heitmann, Katrin, Patzold, Carsten
We present a regularized and renormalized version of the one-loop nonlinear relaxation equations that determine the non-equilibrium time evolution of a classical (constant) field coupled to its...