Detecting Bispectral Acoustic Oscillations from Inflation Using a New Flexible Estimator

Details Detecting Bispectral Acoustic Oscillations from Inflation Using a New Flexible Estimator Detecting Bispectral Acoustic Oscillations from Inflation Using a New Flexible Estimator

2009-11-09

arxiv.org/abs/0911.1642v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

15 pages, 9 jpeg and pdf figures, uses pdflatex and mn2e.cls

Scientific paper

We present a new flexible estimator for comparing theoretical templates for the predicted bispectrum of the CMB anisotropy to observations. This estimator, based on binning in harmonic space, generalizes the optimal estimator of Komatsu, Spergel, and Wandelt by allowing an adjustable weighting scheme for masking possible foreground and other contaminants and detecting particular noteworthy features in the bispectrum. The utility of this estimator is illustrated by demonstrating how acoustic oscillations in the bispectrum and other details of the bispectral shape could be detected in the future PLANCK data provided that fNL is sufficiently large. The character and statistical weight of the acoustic oscillations and the decay tail are described in detail.

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