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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…
Model Independent Early Expansion History and Dark Energy
Johan Samsing, Eric V. Linder, Tristan L. Smith
We examine model independent constraints on the high redshift and prerecombination expansion history from cosmic microwave background observations, using a combination of principal…
The probability distribution for non-Gaussianity estimators constructed from the CMB trispectrum
Tristan L. Smith, Marc Kamionkowski
Considerable recent attention has focussed on the prospects to use the cosmic microwave background (CMB) trispectrum to probe the physics of the early universe. Here we evaluate th…
Improved limits on short-wavelength gravitational waves from the cosmic microwave background
Irene Sendra, Tristan L. Smith
The cosmic microwave background (CMB) is affected by the total radiation density around the time of decoupling. At that epoch, neutrinos comprised a significant fraction of the rad…