Beyond the power spectrum: primordial and secondary non-Gaussianity in the microwave background

Details Beyond the power spectrum: primordial and secondary non-Gaussianity in the microwave background Beyond the power spectrum: primordial and secondary non-Gaussianity in the microwave background

2011-11-08

arxiv.org/abs/1111.1783v1

ASP Conference Series 432 (2009), p. 147

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Invited Review, ASP conference proceedings of the "Frank N. Bash Symposium 2009: New Horizons in Astronomy"

Scientific paper

Cosmic microwave background observations are most commonly analyzed by estimating the power spectrum. In the limit where the CMB statistics are perfectly Gaussian, this extracts all the information, but the CMB also contains detectable non-Gaussian contributions from secondary, and possibly primordial, sources. We review possible sources of CMB non-Gaussianity and describe statistical techniques which are optimized for measuring them, complementing the power spectrum analysis. The machinery of $N$-point correlation functions provides a unifying framework for optimal estimation of primordial non-Gaussian signals or gravitational lensing. We review recent results from applying these estimators to data from the WMAP satellite mission.

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