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An improved estimator for non-Gaussianity in cosmic microwave background observations
Tristan L. Smith, Daniel Grin, Marc Kamionkowski
An improved estimator for the amplitude fnl of local-type non-Gaussianity from the cosmic microwave background (CMB) bispectrum is discussed. The standard estimator is constructed…
Wigner-Eckart theorem in cosmology: Bispectra for total-angular-momentum waves
Liang Dai, Donghui Jeong, Marc Kamionkowski
Total-angular-momentum (TAM) waves provide a set of basis functions for scalar, vector, and tensor fields that can be used in place of plane waves and that reflect the rotational s…
21-cm Lensing and the Cold Spot in the Cosmic Microwave Background
Ely D. Kovetz, Marc Kamionkowski
An extremely large void and a cosmic texture are two possible explanations for the cold spot seen in the cosmic microwave background. We investigate how well these two hypotheses c…
Patchy Screening of the Cosmic Microwave Background by Inhomogeneous Reionization
Vera Gluscevic, Marc Kamionkowski, Duncan Hanson
We derive a constraint on patchy screening of the cosmic microwave background from inhomogeneous reionization, using off-diagonal TB and TT correlations in WMAP-7 temperature/polar…
Galaxy-cluster masses via 21st-century measurements of lensing of 21-cm fluctuations
Ely D. Kovetz, Marc Kamionkowski
We discuss the prospects to measure galaxy-cluster properties via weak lensing of 21-cm fluctuations from the dark ages and the epoch of reionization (EOR). We choose as a figure o…
Total Angular Momentum Waves for Scalar, Vector, and Tensor Fields
Liang Dai, Marc Kamionkowski, Donghui Jeong
Most calculations in cosmological perturbation theorydecompose those perturbations into plane waves (Fourier modes). However, for some calculations, particularly those involving ob…