A new approach to probing primordial non-Gaussianity

Dipak Munshi, Alan Heavens

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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 optimized 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 optimized for partial sky coverage and inhomogeneous noise associated with realistic scan strategies, but which retain the ability to assess foreground contamination.

Original languageEnglish
Pages (from-to)2406-2418
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume401
Issue number4
DOIs
Publication statusPublished - 1 Feb 2010

Keywords / Materials (for Non-textual outputs)

  • methods: analytical
  • methods: numerical
  • methods: statistical
  • cosmic microwave background
  • cosmology: theory
  • large-scale structure of Universe
  • MICROWAVE BACKGROUND BISPECTRUM
  • POLARIZATION ANISOTROPIES
  • INFLATIONARY MODELS
  • WMAP OBSERVATIONS
  • FAST ESTIMATOR
  • TEMPERATURE
  • FLUCTUATIONS
  • POWER
  • MAPS

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