Galli, Silvia, Melchiorri, Alessandro, Smoot, George F., Zahn, Oliver
We present new constraints on cosmic variations of Newton's gravitational constant by making use of the latest CMB data from WMAP, BOOMERANG, CBI and ACBAR experiments and independent constraints...
Cosmology from the Highly-Redshifted 21 cm Line (2009)
Furlanetto, Steven, Lidz, Adam, Loeb, Abraham, McQuinn, Matthew, Pritchard, Jonathan, Shapiro, Paul, ...
One of the next decade's most exciting prospects is to explore the cosmic "dark ages," during which the first stars in the Universe formed, with the 21 cm line of neutral hydrogen. At z>6, this light...
Astrophysics from the Highly-Redshifted 21 cm Line (2009)
Furlanetto, Steven, Lidz, Adam, Loeb, Abraham, McQuinn, Matthew, Pritchard, Jonathan, Aguirre, James, ...
The cosmic dark ages and the epoch of reionization, during which the first generations of stars and galaxies formed, are among the most compelling frontiers of extragalactic astrophysics and...
CMB Lensing Constraints on Neutrinos and Dark Energy (2009)
De Putter, Roland, Zahn, Oliver, Linder, Eric V.
Signatures of lensing of the cosmic microwave background radiation by gravitational potentials along the line of sight carry with them information on the matter distribution, neutrino masses, and...
CMBPol Mission Concept Study: Gravitational Lensing (2008)
Smith, Kendrick M., Cooray, Asantha, Das, Sudeep, Doré, Olivier, Hanson, Duncan, Hirata, Chris, ...
Gravitational lensing of the cosmic microwave background by large-scale structure in the late universe is both a source of cosmological information and a potential contaminant of primordial gravity...
CMBPol Mission Concept Study: Reionization Science with the Cosmic Microwave Background (2008)
Zaldarriaga, Matias, Colombo, Loris, Komatsu, Eiichiro, Lidz, Adam, Mortonson, Michael, Oh, S. Peng, ...
We summarize existing constraints on the epoch of reionization and discuss the observational probes that are sensitive to the process. We focus on the role large scale polarization can play....
Probing Reionization with the 21 cm-Galaxy Cross Power Spectrum (2008)
Lidz, Adam, Zahn, Oliver, Furlanetto, Steven, McQuinn, Matthew, Hernquist, Lars, Zaldarriaga, Matias
The cross-correlation between high redshift galaxies and 21 cm emission from the high redshift intergalactic medium (IGM) promises to be an excellent probe of the Epoch of Reionization (EoR). On...
Cosmic Microwave Weak lensing data as a test for the dark universe (2008)
Calabrese, Erminia, Slosar, Anze, Melchiorri, Alessandro, Smoot, George F., Zahn, Oliver
Combined analyses of WMAP 3-year and ACBAR Cosmic Microwave Anisotropies angular power spectra have presented evidence for gravitational lensing >3 sigma level. This signal could provide a relevant...
How accurately can 21 cm tomography constrain cosmology? (2008)
Mao, Yi, Tegmark, Max, McQuinn, Matthew, Zaldarriaga, Matias, Zahn, Oliver
There is growing interest in using 3-dimensional neutral hydrogen mapping with the redshifted 21 cm line as a cosmological probe, as it has been argued to have a greater long-term potential than the...
Detecting the Rise and Fall of 21 cm Fluctuations with the Murchison Widefield Array (2007)
Lidz, Adam, Zahn, Oliver, McQuinn, Matthew, Zaldarriaga, Matias, Hernquist, Lars
We forecast the sensitivity with which the Murchison Widefield Array (MWA) can measure the 21 cm power spectrum of cosmic hydrogen, using radiative transfer simulations to model reionization and the...
Detection of Gravitational Lensing in the Cosmic Microwave Background (2007)
Smith, Kendrick M., Zahn, Oliver, Dore, Olivier
Gravitational lensing of the cosmic microwave background (CMB), a long-standing prediction of the standard cosmolgical model, is ultimately expected to be an important source of cosmological...
Illuminating the Universe : New Probes of Reionization and Cosmology (2007)
We model the epoch of hydrogen reionisation of the universe, using analytic as well as numerical methods. In a detailed statistical analysis of our results, we find good agreement in the alternative...
The morphology of HII regions during reionization (2006)
McQuinn, Matthew, Lidz, Adam, Zahn, Oliver, Dutta, Suvendra, Hernquist, Lars, Zaldarriaga, Matias
It is possible that the properties of HII regions during reionization depend sensitively on many poorly constrained quantities (the nature of the ionizing sources, the clumpiness of the gas in the...
Higher Order Contributions to the 21 cm Power Spectrum (2006)
Lidz, Adam, Zahn, Oliver, McQuinn, Matthew, Zaldarriaga, Matias, Dutta, Suvendra, Hernquist, Lars
We consider the contribution of 3rd and 4th order terms to the power spectrum of 21 cm brightness temperature fluctuations during the epoch of reionization, which arise because the 21 cm brightness...
Simulations and Analytic Calculations of Bubble Growth During Hydrogen Reionization (2006)
Zahn, Oliver, Lidz, Adam, McQuinn, Matthew, Dutta, Suvendra, Hernquist, Lars, Zaldarriaga, Matias, ...
We present results from a large volume simulation of Hydrogen reionization. We combine 3d radiative transfer calculations and an N-body simulation, describing structure formation in the intergalactic...
Cosmological Parameter Estimation Using 21 cm Radiation from the Epoch of Reionization (2005)
McQuinn, Matthew, Zahn, Oliver, Zaldarriaga, Matias, Hernquist, Lars, Furlanetto, Steven R.
A number of radio interferometers are currently being planned or constructed to observe 21 cm emission from reionization. Not only will such measurements provide a detailed view of that epoch, but,...
Lensing Reconstruction using redshifted 21cm Fluctuations (2005)
Zahn, Oliver, Zaldarriaga, Matias
We investigate the potential of second generation measurements of redshifted 21 cm radiation from before and during the epoch of reionization (EOR) to reconstruct the matter density fluctuations...
The Kinetic Sunyaev-Zel'dovich Effect from Reionization (2005)
McQuinn, Matthew, Furlanetto, Steven R., Hernquist, Lars, Zahn, Oliver, Zaldarriaga, Matias
During the epoch of reionization, local variations in the ionized fraction (patchiness) imprint arcminute-scale temperature anisotropies in the CMB through the kinetic Sunyaev-Zel'dovich (kSZ)...
The influence of non-uniform reionization on the CMB (2005)
Zahn, Oliver, Zaldarriaga, Matias, Hernquist, Lars, McQuinn, Matthew
We investigate the impact of spatial variations in the ionized fraction during reionization on temperature anisotropies in the CMB. We combine simulations of large scale structure to describe the...
Probing the Friedmann equation during recombination with future CMB experiments (2002)
Zahn, Oliver, Zaldarriaga, Matias
We show that by combining measurements of the temperature and polarization anisotropies of the Cosmic Microwave Background (CMB), future experiments will tightly constrain the expansion rate of the...