Keith Tauscher
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View article: Constraining Warm Dark Matter and Population III Stars with the Global 21 cm Signal
Constraining Warm Dark Matter and Population III Stars with the Global 21 cm Signal Open
Upcoming ground- and space-based experiments may have sufficient accuracy to place significant constraints upon high-redshift star formation, Reionization, and dark matter (DM) using the global 21 cm signal of the intergalactic medium. In …
View article: Lost Horizon: Quantifying the Effect of Local Topography on Global 21 cm Cosmology Data Analysis
Lost Horizon: Quantifying the Effect of Local Topography on Global 21 cm Cosmology Data Analysis Open
We present an investigation of the horizon and its effect on global 21 cm observations and analysis. We find that the horizon cannot be ignored when modeling low-frequency observations. Even if the sky and antenna beam are known exactly, f…
View article: Global 21 cm Signal Extraction from Foreground and Instrumental Effects. IV. Accounting for Realistic Instrument Uncertainties and Their Overlap with Foreground and Signal Models
Global 21 cm Signal Extraction from Foreground and Instrumental Effects. IV. Accounting for Realistic Instrument Uncertainties and Their Overlap with Foreground and Signal Models Open
All 21 cm signal experiments rely on electronic receivers that affect the data via both multiplicative and additive biases through the receiver’s gain and noise temperature. While experiments attempt to remove these biases, the residuals o…
View article: Modeling the Galactic Foreground and Beam Chromaticity for Global 21 cm Cosmology
Modeling the Galactic Foreground and Beam Chromaticity for Global 21 cm Cosmology Open
In order to characterize and model the beam-weighted foreground for global 21 cm signal experiments, we present a methodology for generating basis eigenvectors that combines analytical and observational models of both the galactic spectral…
View article: Ensuring Robustness in Training Set Based Global 21-cm Cosmology Analysis
Ensuring Robustness in Training Set Based Global 21-cm Cosmology Analysis Open
We present a methodology for ensuring the robustness of our analysis pipeline in separating the global 21-cm hydrogen cosmology signal from large systematics based on singular value decomposition (SVD) of training sets. We show how traditi…
View article: Global 21 cm Signal Extraction from Foreground and Instrumental Effects. III. Utilizing Drift-scan Time Dependence and Full Stokes Measurements
Global 21 cm Signal Extraction from Foreground and Instrumental Effects. III. Utilizing Drift-scan Time Dependence and Full Stokes Measurements Open
When using valid foreground and signal models, the uncertainties on extracted signals in global 21 cm signal experiments depend principally on the overlap between signal and foreground models. In this paper, we investigate two strategies f…
View article: Assessment of the Projection-induced Polarimetry Technique for Constraining the Foreground Spectrum in Global 21 cm Cosmology
Assessment of the Projection-induced Polarimetry Technique for Constraining the Foreground Spectrum in Global 21 cm Cosmology Open
Detecting the cosmological sky-averaged (global) 21 cm signal as a function of observed frequency will provide a powerful tool to study the ionization and thermal history of the intergalactic medium (IGM) in the early universe (∼400 millio…
View article: Dark Cosmology: Investigating Dark Matter & Exotic Physics in the Dark Ages using the Redshifted 21-cm Global Spectrum
Dark Cosmology: Investigating Dark Matter & Exotic Physics in the Dark Ages using the Redshifted 21-cm Global Spectrum Open
The Dark Ages, probed by the redshifted 21-cm signal, is the ideal epoch for a new rigorous test of the standard LCDM cosmological model. Divergences from that model would indicate new physics, such as dark matter decay (heating) or baryon…
View article: A Space-based Observational Strategy for Characterizing the First Stars and Galaxies Using the Redshifted 21 cm Global Spectrum
A Space-based Observational Strategy for Characterizing the First Stars and Galaxies Using the Redshifted 21 cm Global Spectrum Open
The redshifted 21 cm monopole is expected to be a powerful probe of the epoch of the first stars and galaxies ( ). The global 21 cm signal is sensitive to the thermal and ionization state of hydrogen gas and thus provides a tracer of sourc…