Kitaura, Francisco S., Jasche, Jens, Metcalf, R. Benton
We present a general expression for a lognormal filter given an arbitrary nonlinear galaxy bias. We derive this filter as the maximum a posteriori solution assuming a lognormal prior distribution for...
Cosmic Cartography of the Large-Scale Structure with Sloan Digital Sky Survey Data Release 6 (2009)
Kitaura, Francisco S., Jasche, Jens, Li, Cheng, Ensslin, Torsten A., Metcalf, R. Benton, Wandelt, Benjamin D., ...
We present the largest Wiener reconstruction of the cosmic density field made to date. The reconstruction is based on the Sloan Digital Sky Survey data release 6 covering the northern Galactic cap....
Neutrino Masses, Dark Energy and the Gravitational Lensing of Pregalactic HI (2009)
We study the constraints which the next generation of radio telescopes could place on the mass and number of neutrino species by studying the gravitational lensing of high redshift 21 cm emission in...
The Observatory for Multi-Epoch Gravitational Lens Astrophysics (OMEGA) (2008)
Moustakas, Leonidas A, Bolton, Adam J, Booth, Jeffrey T, Bullock, James S, Cheng, Edward, Coe, Dan, ...
(abridged) The Observatory for Multi-Epoch Gravitational Lens Astrophysics (OMEGA) is a mission concept for a 1.5-m near-UV through near-IR space observatory that will be dedicated to frequent...
Gravitational Lensing of Pregalactic 21 cm Radiation (2008)
Low-frequency radio observations of neutral hydrogen during and before the epoch of cosmic reionization will provide hundreds of quasi-independent source planes, each of precisely known redshift, if...
Cosmological Information in the Gravitational Lensing of Pregalactic HI (2008)
Metcalf, R. Benton, White, S. D. M.
We study the constraints which the next generation of radio telescopes could place on the nature of dark energy, dark matter and inflation by studying the gravitational lensing of high redshift 21 cm...
The Observatory for Multi-Epoch Gravitational Lens Astrophysics (OMEGA) (2008)
Moustakas, Leonidas A., Bolton, Adam J., Booth, Jeffrey T., Bullock, James S., Cheng, Edward, Coe, Dan, ...
Imaging the Cosmic Matter Distribution using Gravitational Lensing of Pregalactic HI (2007)
Hilbert, Stefan, Metcalf, R. Benton, White, S. D. M.
21-cm emission from neutral hydrogen during and before the epoch of cosmic reionisation is gravitationally lensed by material at all lower redshifts. Low-frequency radio observations of this emission...
Metcalf, R. Benton, Silk, Joseph
We use the distribution, and particularly the skewness, of high redshift type Ia supernovae brightnesses relative to the low redshift sample to constrain the density of macroscopic compact objects...
Metcalf, R. Benton, White, S. D. M.
Low-frequency radio observations of neutral hydrogen during and before the epoch of cosmic reionization will provide ~ 1000 quasi-independent source planes, each of precisely known redshift, if a...
Smooth Particle Lensing (2006)
Aubert, Dominique, Amara, Adam, Metcalf, R. Benton
We present a numerical technique to compute the gravitational lensing induced by simulated haloes. It relies on a 2D-Tree domain decomposition in the lens plane combined with a description of N-Body...
The Importance of Intergalactic Structure to Gravitationally Lensed Quasars (2004)
Image flux ratio anomalies have been attributed to substructures within the gravitational lens and to small mass halos (M
Simulations of Strong Gravitational Lensing with Substructure (2004)
Amara, Adam, Metcalf, R. Benton, Cox, Thomas J., Ostriker, Jeremiah P.
Galactic sized gravitational lenses are simulated by combining a cosmological N-body simulation and models for the baryonic component of the galaxy. The lens caustics, critical curves, image...
Small-Scale Structure, Missing Galaxies and Gravitational Lensing (2004)
The gravitational lensing constraints on the small mass end of the LCDM mass function are discussed. Here a conservative approach is taken where only the most difficult to explain image flux...
Confronting LCDM with Gravitational Lensing Constraints on Small Scale Structure (2004)
This paper primarily addresses the question of whether recent lensing observations probing the small scale structure in the universe are consistent with the LCDM model. A conservative approach is...
Detecting dark matter substructure spectroscopically in strong gravitational lenses (2002)
Moustakas, Leonidas A., Metcalf, R. Benton
The Cold Dark Matter (CDM) model for galaxy formation predicts that a significant fraction of mass in the dark matter haloes that surround L L* galaxies is bound in substructures of mass 1E4-1E7Msun....
The Detection of Pure Dark Matter Objects with Bent Multiply Imaged Radio Jets (2002)
When a gravitational lens produces two or more images of a quasar's radio jet the images can be compared to reveal the presence of small structures along one or more of the lines of sight. If mass is...
Flux ratios as a probe of dark substructures in quadruple-image gravitational lenses (2001)
Metcalf, R. Benton, Zhao, HongSheng
We demonstrate that the flux ratios of 4-image lensed quasars provide a powerful means of probing the small scale structure of Dark Matter (DM) halos. A family of smooth lens models can precisely...
The Dark Galaxy Problem and the Effects of Substructure on Gravitational Lenses (2001)
I argue that the cold dark matter (CDM) model requires that even within a few kpc of the center of a galactic halo a significant fraction (greater than a few percent) of the surface density is...
Compound gravitational lensing as a probe of dark matter substructure within galaxy halos (2001)
Metcalf, R. Benton, Madau, Piero
We show how observations of multiply-imaged quasars at high redshift can be used as a probe of dark matter clumps (subhalos with masses ~ 10^9 solar masses) within the virialized extent of more...
Probing the Structure of Dark Matter in Galaxy Halos and Clusters using Supernovae (2000)
A new method for measuring gravitational lensing with high redshift type Ia supernovae is investigated. The method utilizes correlations between foreground galaxies and supernova brightnesses to...
Prospects for the Lensing of Supernovae (2000)
Observations of high redshift type Ia supernovae (SNe) will enable us to probe the structure of galaxy halos and the composition of dark matter. The future prospects for this field are briefly...
A Fundamental Test of the Nature of Dark Matter (1999)
Metcalf, R. Benton, Silk, Joseph
Dark matter may consist of weakly interacting elementary particles or of macroscopic compact objects. We show that the statistics of the gravitational lensing of high redshift supernovae strongly...
The Detection of The Gravitational Lensing of Supernovae (1998)
The weak gravitational lensing of high redshift type Ia supernovae has the potential of probing the structure of matter on galaxy halo scales. This is complementary to the weak lensing of galaxies...
Gravitational Lensing of High Redshift Type Ia Supernova: A Probe of Medium Scale Structure (1998)
The dispersion in the peak luminosities of high redshift type Ia supernovae will change with redshift due to gravitational lensing. This lensing is investigated with an emphasis on the prospects of...
On Breaking Cosmic Degeneracy (1997)
Metcalf, R. Benton, Silk, Joseph
It has been argued that the power spectrum of the anisotropies in the Cosmic Microwave Background (CMB) may be effectively degenerate, namely that the observable spectrum does not determine a unique...
Gravitational Magnification of the Cosmic Microwave Background (1997)
Metcalf, R. Benton, Silk, Joseph
Some aspects of gravitational lensing by large scale structure (LSS) are investigated. We show that lensing causes the damping tail of the cosmic microwave background (CMB) power spectrum to fall...
Gravitational Microlensing by Clustered MACHOs (1995)
Metcalf, R Benton, Silk, Joseph
It has been proposed that the MACHOs in our galaxy could be clumped in globular cluster--like associations or RAMBOs (robust associations of massive baryonic objects) (Moore \& Silk 1995). Here we...