No Evidence for Dark Energy Dynamics from a Global Analysis of Cosmological Data (2009)
Serra, Paolo, Cooray, Asantha, Holz, Daniel E., Melchiorri, Alessandro, Pandolfi, Stefania, Sarkar, Devdeep
We use a variant of principal component analysis to investigate the possible temporal evolution of the dark energy equation of state, w(z). We constrain w(z) in multiple redshift bins, utilizing the...
Ultra-high precision cosmology from gravitational waves (2009)
We show that the Big Bang Observer (BBO), a proposed space-based gravitational-wave (GW) detector, would provide ultra-precise measurements of cosmological parameters. By detecting ~300,000...
Weak lensing and dark energy: the impact of dark energy on nonlinear dark matter clustering (2009)
Joudaki, Shahab, Cooray, Asantha, Holz, Daniel E.
We examine the influence of percent-level dark energy corrections to the nonlinear matter power spectrum on constraints of the dark energy equation of state from future weak lensing probes. We...
Exploring short gamma-ray bursts as gravitational-wave standard sirens (2009)
Nissanke, Samaya, Hughes, Scott A., Holz, Daniel E., Dalal, Neal, Sievers, Jonathan L.
Recent observations support the hypothesis that a large fraction of "short-hard" gamma-ray bursts (SHBs) are associated with compact binary inspiral. Since gravitational-wave (GW) measurements of...
Bloom, Joshua S., Holz, Daniel E., Hughes, Scott A., Menou, Kristen, Adams, Allan, Anderson, Scott F., ...
It is widely expected that the coming decade will witness the first direct detection of gravitational waves (GWs). The ground-based LIGO and Virgo GW observatories are being upgraded to advanced...
On The Origin Of The Highest Redshift Gamma-Ray Burst GRB 080913 (2008)
Belczynski, Krzysztof, Hartmann, Dieter H., Fryer, Chris L., Holz, Daniel E., O'Shea, Brian
GRB 080913, discovered by SWIFT, is the most distant gamma-ray burst (GRB) known to-date, with a spectroscopically determined redshift of z=6.7. The detection of a burst at such an early epoch of the...
Measuring dark energy spatial inhomogeneity with supernova data (2008)
Cooray, Asantha, Holz, Daniel E., Caldwell, Robert
The gravitational lensing distortion of distant sources by the large-scale distribution of matter in the Universe has been extensively studied. In contrast, very little is known about the effects due...
Implications of Two Type Ia Supernova Populations for Cosmological Measurements (2008)
Sarkar, Devdeep, Amblard, Alexandre, Cooray, Asantha, Holz, Daniel E.
Recent work suggests that Type Ia supernovae (SNe) are composed of two distinct populations: prompt and delayed. By explicitly incorporating properties of host galaxies, it may be possible to target...
Toward a halo mass function for precision cosmology: the limits of universality (2008)
Tinker, Jeremy L, Kravtsov, Andrey V, Klypin, Anatoly, Abazajian, Kevork, Warren, Michael S, Yepes, Gustavo, ...
We measure the mass function of dark matter halos in a large set of collisionless cosmological simulations of flat LCDM cosmology and investigate its evolution at z
GRAVITATIONAL WAVE EMISSION FROM CORE COLLAPSE OF MASSIVE STARS (2007)
Chris L. Fryer, Daniel E. Holz, A. Hughes
We derive estimates for the characteristics of gravitational radiation from stellar collapse, using recent models of the core collapse of Chandrasekhar-massed white dwarfs (accretion-induced...
Gravitational Wave Emission From Core-Collapse of Massive Stars (2007)
Chris L. Fryer, Daniel E. Holz, Scott A. Hughes
We derive estimates for the characteristics of gravitational radiation from stellar collapse, using recent models of the core-collapse of Chandrasekhar mass white dwarfs (accretion induced collapse),...
The gravitational waves generated in the coalescence of massive binary black holes will be measurable by LISA to enormous distances. Redshifts z or larger (depending somewhat on the mass of the...
Gravitational Waves Chris, Chris L. Fryer, Daniel E. Holz, Scott A. Hughes, Michael S. Warren
The new generation of gravitational wave (GW) detectors have the potential to open a novel window onto the violent dynamics of core collapse. Although it is certain that core collapse events generate...
Lensing and Supernovae: Quantifying The Bias on the Dark Energy Equation of State (2007)
Sarkar, Devdeep, Amblard, Alexandre, Holz, Daniel E., Cooray, Asantha
The gravitational magnification and demagnification of Type Ia supernovae (SNe) modify their positions on the Hubble diagram, shifting the distance estimates from the underlying luminosity-distance...
Beyond Two Dark Energy Parameters (2007)
Sarkar, Devdeep, Sullivan, Scott, Joudaki, Shahab, Amblard, Alexandre, Holz, Daniel E., Cooray, Asantha
Our ignorance of the dark energy is generally described by a two-parameter equation of state. In these approaches a particular {\it ad hoc} functional form is assumed, and only two independent...
CMB Cluster Lensing: Cosmography with the Longest Lever Arm (2007)
Hu, Wayne, Holz, Daniel E., Vale, Chris
We discuss combining gravitational lensing of galaxies and the cosmic microwave background (CMB) by clusters to measure cosmographic distance ratios, and hence dark energy parameters. Advantages to...
Narrowing Constraints with Type Ia Supernovae: Converging on a Cosmological Constant (2007)
Sullivan, Scott, Cooray, Asantha, Holz, Daniel E.
We apply a parameterization-independent approach to fitting the dark energy equation-of-state (EOS). Utilizing the latest type Ia supernova data, combined with results from the cosmic microwave...
Close Pairs as Proxies for Galaxy Cluster Mergers (2007)
Wetzel, Andrew R., Schulz, A. E., Holz, Daniel E., Warren, Michael S.
Galaxy cluster merger statistics are an important component in understanding the formation of large-scale structure. Unfortunately, it is difficult to study merger properties and evolution directly...
Direct reconstruction of the dark energy scalar-field potential (2007)
Li, Chao, Holz, Daniel E., Cooray, Asantha
While the accelerated expansion of the Universe is by now well established, an underlying scalar-field potential possibly responsible for this acceleration remains unconstrained. We present an...
Direct Reconstruction of the Dark Energy Scalar-Field Potential (2006)
Li, Chao, Holz, Daniel E., Cooray, Asantha
While the accelerated expansion of the Universe is by now well established, an underlying scalar field potential possibly responsible for this acceleration remains unconstrained. We present an...
The Clustering of Massive Halos (2006)
Wetzel, Andrew R., Cohn, J. D., White, Martin, Holz, Daniel E., Warren, Michael S.
The clustering properties of dark matter halos are a firm prediction of modern theories of structure formation. We use two large volume, high-resolution N-body simulations to study how the...
Short GRB and binary black hole standard sirens as a probe of dark energy (2006)
Dalal, Neal, Holz, Daniel E., Hughes, Scott A., Jain, Bhuvnesh
Observations of the gravitational radiation from well-localized, inspiraling compact object binaries can measure absolute source distances with high accuracy. When coupled with an independent...
Precision Determination of the Mass Function of Dark Matter Halos (2005)
Warren, Michael S., Abazajian, Kevork, Holz, Daniel E., Teodoro, Luis
The predicted mass function of dark matter halos is essential in connecting observed galaxy cluster counts and models of galaxy clustering to the properties of the primordial density field. We...
Using gravitational-wave standard sirens (2005)
Holz, Daniel E., Hughes, Scott A.
Gravitational waves (GWs) from supermassive binary black hole (BBH) inspirals are potentially powerful standard sirens (the GW analog to standard candles) (Schutz 1986, 2002). Because these systems...
Holz, Daniel E., Linder, Eric V.
Observation of the expansion history of the Universe allows exploration of the physical properties and energy density of the Universe's various constituents. Standardizable candles such as Type Ia...
How black holes get their kicks: Radiation recoil in binary black hole mergers (2004)
Hughes, Scott A., Favata, Marc, Holz, Daniel E.
Gravitational waves from the coalescence of binary black holes carry linear momentum, causing center of mass recoil. This ``radiation rocket'' has important implications for systems with escape...
Gravitational Waves from Stellar Collapse: Correlations to Explosion Asymmetries (2004)
Fryer, Chris L., Holz, Daniel E., Hughes, Scott A.
The collapse of massive stars not only produces observable outbursts across the entire electromagnetic spectrum but, for Galactic (or near-Galactic) supernovae, detectable signals for ground-based...
How black holes get their kicks: Gravitational radiation recoil revisited (2004)
Favata, Marc, Hughes, Scott A., Holz, Daniel E.
Gravitational waves from the coalescence of binary black holes carry away linear momentum, causing center of mass recoil. This "radiation rocket" effect has important implications for systems with...
Consequences of gravitational radiation recoil (2004)
Merritt, David, Milosavljevic, Milos, Favata, Marc, Hughes, Scott A., Holz, Daniel E.
Coalescing binary black holes experience an impulsive kick due to anisotropic emission of gravitational waves. We discuss the dynamical consequences of the recoil accompanying massive black hole...
Cosmology with coalescing massive black holes (2002)
Hughes, Scott A., Holz, Daniel E.
The gravitational waves generated in the coalescence of massive binary black holes will be measurable by LISA to enormous distances. Redshifts z~10 or larger (depending somewhat on the mass of the...
Stellar collapse and gravitational waves (2002)
Fryer, Chris L., Holz, Daniel E., Hughes, Scott A., Warren, Michael S.
The new generation of gravitational wave (GW) detectors have the potential to open a novel window onto the violent dynamics of core collapse. Although it is certain that core collapse events generate...
Retro-MACHOs: Pi in the sky? (2002)
Holz, Daniel E., Wheeler, John A.
Shine a flashlight on a black hole, and one is greeted with the return of a series of concentric rings of light. For a point source of light, and for perfect alignment of the lens, source, and...
Corrective lenses for high redshift supernovae (2002)
Dalal, Neal, Holz, Daniel E., Chen, Xuelei, Frieman, Joshua A.
Weak lensing of high-redshift Type Ia supernovae induces an external dispersion in their observed standard candle brightnesses, comparable in magnitude to the intrinsic dispersion for redshifts z>1....
A universal probability distribution function for weak-lensing amplification (2002)
Wang, Yun, Holz, Daniel E., Munshi, Dipak
We present an approximate form for the weak lensing magnification distribution of standard candles, valid for all cosmological models, with arbitrary matter distributions, over all redshifts. Our...
On the Remarkable Spectrum of a Non-Hermitean Random Matrix Model (2002)
Holz, Daniel E., Orland, Henri, Zee, A.
A non-Hermitean random matrix model proposed a few years ago has a remarkably intricate spectrum. Various attempts have been made to understand the spectrum, but even its dimension is not known....
Hydrostatic Expansion and Spin Changes During Type I X-Ray Bursts (2001)
Cumming, Andrew, Morsink, Sharon M., Bildsten, Lars, Friedman, John L., Holz, Daniel E.
We present calculations of the spin-down of a neutron star atmosphere due to hydrostatic expansion during a Type I X-ray burst. We show that (i) Cumming and Bildsten overestimated the spin-down of...
Gravitational Wave Emission From Core-Collapse of Massive Stars (2001)
Fryer, Chris L., Holz, Daniel E., Hughes, Scott A.
We derive estimates for the characteristics of gravitational radiation from stellar collapse, using recent models of the core-collapse of Chandrasekhar mass white dwarfs (accretion induced collapse),...
Collisional Dark Matter and Scalar Phantoms (2001)
As has been previously proposed, a minimal modification of the standard $SU(3)\times SU(2)\times U(1)$ theory provides a viable dark matter candidate. Such a particle, a scalar gauge singlet, is...
Seeing double: strong gravitational lensing of high-redshift supernovae (2001)
With the advent of large, deep surveys, the observation of a strongly gravitationally lensed supernova becomes increasingly likely. High-redshift surveys continue apace, with a handful of type Ia...
Constant Crunch Coordinates for Black Hole Simulations (2000)
Gentle, Adrian P., Holz, Daniel E., Kheyfets, Arkady, Laguna, Pablo, Miller, Warner A., Shoemaker, Deirdre M.
We reinvestigate the utility of time-independent constant mean curvature foliations for the numerical simulation of a single spherically-symmetric black hole. Each spacelike hypersurface of such a...
Limits on the Density of Compact Objects from High Redshift Supernovae (1999)
Due to the effects of gravitational lensing, the magnification distribution of high redshift supenovae can be a powerful discriminator between smooth dark matter and dark matter consisting of compact...
Apparent horizons in simplicial Brill wave initial data (1998)
Gentle, Adrian P., Holz, Daniel E., Miller, Warner A., Wheeler, John A.
We construct initial data for a particular class of Brill wave metrics using Regge calculus, and compare the results to a corresponding continuum solution, finding excellent agreement. We then search...
Lensing and high-z supernova surveys (1998)
Gravitational lensing causes the distribution of observed brightnesses of standard candles at a given redshift to be highly non-gaussian. The distribution is strongly, and asymmetrically, peaked at a...
Gravitational Lensing Limits on the Average Redshift of Gamma-Ray Bursts (1998)
Holz, Daniel E., Miller, M. Coleman, Quashnock, Jean M.
The lack of bright host galaxies in several recently examined gamma-ray burst (GRB) error boxes suggests that the redshifts of cosmological GRBs may be significantly higher than previously believed....
Lensing and high-z supernova surveys / (1998)
Thesis (Ph. D.)--University of Chicago, Dept. of Physics, August 1998.
Holz, Daniel E., Wald, Robert M.
We present a new approach to calculating the statistical distributions for magnification, shear, and rotation of images of cosmological sources due to gravitational lensing. In this approach one...
Photon Statistics Limits for Earth-Based Parallax Measurements of MACHO Events (1995)
Holz, Daniel E., Wald, Robert M.
We analyze the limitations imposed by photon counting statistics on extracting useful information about MACHOs from Earth-based parallax observations of microlensing events. We find that if one or...
Habib, Salman, Holz, Daniel E., Kheyfets, Arkady, Matzner, Richard A., Miller, Warner A., Tolman, Brian W.
LAGEOS is an accurately-tracked, dense spherical satellite covered with 426 retroreflectors. The tracking accuracy is such as to yield a medium term (years to decades) inertial reference frame...