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Crossing the Phantom Divide: Dark Energy Internal Degrees of Freedom
Wayne Hu
Dark energy constraints have forced viable alternatives that differ substantially from a cosmological constant Lambda to have an equation of state w that evolves across the phantom…
Measuring Dark Energy Clustering with CMB-Galaxy Correlations
Wayne Hu, Ryan Scranton
The integrated Sachs-Wolfe (ISW) effect in the cosmic microwave background (CMB) as measured through its correlation with galaxies provides a unique opportunity to study the dynami…
Dark Energy Probes in Light of the CMB
Wayne Hu
CMB observables have largely fixed the expansion history of the universe in the deceleration regime and provided two self-calibrated absolute standards for dark energy studies: the…
A Low CMB Quadrupole from Dark Energy Isocurvature Perturbations
Christopher Gordon, Wayne Hu
We explicate the origin of the temperature quadrupole in the adiabatic dark energy model and explore the mechanism by which scale invariant isocurvature dark energy perturbations c…
Weak Lensing of the CMB: Sampling Errors on B-Modes
Kendrick M. Smith, Wayne Hu, Manoj Kaplinghat
The B modes generated by the lensing of CMB polarization are a primary target for the upcoming generation of experiments and can potentially constrain quantities such as the neutri…
Covariant Linear Perturbation Formalism
Wayne Hu
Lecture notes on covariant linear perturbation theory and its applications to inflation, dark energy or matter and the cosmic microwave background.