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Non-linear Evolution of f(R) Cosmologies III: Halo Statistics
Fabian Schmidt, Marcos Lima, Hiroaki Oyaizu +1
The statistical properties of dark matter halos, the building blocks of cosmological observables associated with structure in the universe, offer many opportunities to test models…
Crossing the Phantom Divide with Parameterized Post-Friedmann Dark Energy
Wenjuan Fang, Wayne Hu, Antony Lewis
Dark energy models with a single scalar field cannot cross the equation of state divide set by a cosmological constant. More general models that allow crossing require additional d…
Non-linear evolution of f(R) cosmologies II: power spectrum
Hiroaki Oyaizu, Marcos Lima, Wayne Hu
We carry out a suite of cosmological simulations of modified action f(R) models where cosmic acceleration arises from an alteration of gravity instead of dark energy. These models…
Reionization constraints from five-year WMAP data
Michael J. Mortonson, Wayne Hu
We study the constraints on reionization from five years of WMAP data, parametrizing the evolution of the average fraction of ionized hydrogen with principal components that provid…
Lecture Notes on CMB Theory: From Nucleosynthesis to Recombination
Wayne Hu
These lecture notes comprise an informal but pedagogical introduction to the well established physics and phenomenology of the cosmic microwave background (CMB) between big bang nu…
Parametrized Post-Friedmann Signatures of Acceleration in the CMB
Wayne Hu
We extend the covariant, parametrized post-Friedmann treatment of cosmic acceleration from modified gravity to an arbitrary admixture of matter, radiation, relativistic components…