The Angular Trispectra of CMB Temperature and Polarization

Details The Angular Trispectra of CMB Temperature and Polarization The Angular Trispectra of CMB Temperature and Polarization

2002-06-10

arxiv.org/abs/astro-ph/0206155v2

Phys.Rev.D66:063008,2002

Astronomy and Astrophysics

Astrophysics

16 pages, 4 figures; typographical errors corrected

Scientific paper

10.1103/PhysRevD.66.063008

We develop the formalism necessary to study four-point functions of the cosmic microwave background (CMB) temperature and polarization fields. We determine the general form of CMB trispectra, with the constraints imposed by the assumption of statistical isotropy of the CMB fields, and derive expressions for their estimators, as well as their Gaussian noise properties. We apply these techniques to initial non-Gaussianity of a form motivated by inflationary models. Due to the large number of four-point configurations, the sensitivity of the trispectra to initial non-Gaussianity approaches that of the temperature bispectrum at high multipole moment. These trispectra techniques will also be useful in the study of secondary anisotropies induced for example by the gravitational lensing of the CMB by the large scale structure of the universe.

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