The Komatsu Spergel Wandelt estimator for oscillations in the cosmic microwave background bispectrum

Moritz Münchmeyer (1, 2) , François Bouchet (1, 2) , Mark G. Jackson (1, 3) , Benjamin Wandelt (1, 2)

1 IAP - Institut d'Astrophysique de Paris
2 UPCité - Université Paris Cité
3 APC (UMR_7164) - AstroParticule et Cosmologie

Oscillating shapes of the primordial bispectrum are present in many inflationary models. The Planck experiment has recently published measurements of oscillating shapes, which were, however, limited to the efficient frequency range of the used analysis method. Here, we study the Komatsu Spergel Wandelt (KSW) estimator for oscillations in the cosmic microwave background bispectrum, that examines arbitrary oscillation frequencies for separable oscillating bispectrum shapes. We study the precision with which amplitude, phase, and frequency can be determined with our estimator. An examination of the three-point function in real space gives further insight into the estimator.

Keywords: cosmic background radiation; inflation; early Universe; cosmology: observations; Astrophysics - Cosmology and Nongalactic Astrophysics

Domains: Sciences of the Universe [physics]; Astrophysics [astro-ph]

Moritz Münchmeyer, François Bouchet, Mark G. Jackson, Benjamin Wandelt. The Komatsu Spergel Wandelt estimator for oscillations in the cosmic microwave background bispectrum. Astronomy and Astrophysics - A&A, 2014, 570, ⟨10.1051/0004-6361/201424179⟩. ⟨insu-03645309⟩