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Monthly Notices of the Royal Astronomical Society 407 (2010) 2193-2206
Detecting bispectral acoustic oscillations from inflation using a new flexible estimator
M. Bucher1, 2, B. Van Tent1, C.S. Carvalho1, 3

We present a new flexible estimator for comparing theoretical templates for the predicted bispectrum of the cosmic microwave background (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.
1 :  LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
2 :  APC - UMR 7164 - AstroParticule et Cosmologie
3 :  University of KwaZulu-Natal
APC - Cosmologie et Gravitation
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
methods: statistical – cosmic background radiation – early Universe
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