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arXiv · 0904.4478

A New Approach to Probing Primordial Non-Gaussianity

Dipak Munshi·Alan Heavens
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Abstract

We address the dual challenge of estimating deviations from Gaussianity arising in models of the Early Universe, whilst retaining information necessary to assess whether a detection of non-Gaussianity is primordial. We do this by constructing a new statistic, the bispectrum-related power spectrum, which is constructed from a map of the Cosmic Microwave Background. The estimator is optimised for primordial non-Gaussianity detection, but can also be useful in distinguishing primordial non-Gaussianity from secondary non-Gaussianity, such as may arise from unsubtracted point sources, or residuals from component separation. Extending earlier studies we present unbiased non-Gaussianity estimators optimised for partial sky coverage and inhomogeneous noise associated with realistic scan strategies, but which retain the ability to assess foreground contamination.

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Dipak Munshi, Alan Heavens. 2009-04-28. A New Approach to Probing Primordial Non-Gaussianity. https://doi.org/10.1111/j.1365-2966.2009.15820.x

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