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Cosmological hydrogen recombination: The effect of extremely high-n states
Daniel Grin, Christopher M. Hirata
Calculations of cosmological hydrogen recombination are vital for the extraction of cosmological parameters from cosmic microwave background (CMB) observations, and for imposing co…
Weak lensing power spectra for precision cosmology: Multiple-deflection, reduced shear and lensing bias corrections
Elisabeth Krause, Christopher M. Hirata
It is usually assumed that the ellipticity power spectrum measured in weak lensing observations can be expressed as an integral over the underlying matter power spectrum. This is t…
Constraints on cosmic hemispherical power anomalies from quasars
Christopher M. Hirata
Recent analyses of the cosmic microwave background (CMB) maps from the WMAP satellite have uncovered evidence for a hemispherical power anomaly, i.e. a dipole modulation of the CMB…
A Scale-Dependent Power Asymmetry from Isocurvature Perturbations
Adrienne L. Erickcek, Christopher M. Hirata, Marc Kamionkowski
If the hemispherical power asymmetry observed in the cosmic microwave background (CMB) on large angular scales is attributable to a superhorizon curvaton fluctuation, then the simp…
Observing the Evolution of the Universe
James Aguirre, Alexandre Amblard, Amjad Ashoorioon +172
How did the universe evolve? The fine angular scale (l>1000) temperature and polarization anisotropies in the CMB are a Rosetta stone for understanding the evolution of the univers…
Tidal alignments as a contaminant of redshift space distortions
Christopher M. Hirata
We investigate the effect of orientation-dependent selection effects on galaxy clustering in redshift space. It is found that if galaxies are aligned by large-scale tidal fields, t…