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Abstract:
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More than a decade ago two physicists, Wayne Hu and Takemi Okamoto, invented a new estimator for measuring the dark matter distortion imprinted on the our observations of the cosmic microwave background (which is a relic signal of the big bang). Their estimator, called the quadratic estimator, quickly became the state-of-the-art tool for the detecting, measuring and mapping dark matter. From a spatial statistics perspective this estimator has some remarkable properties. In this talk I will present an analysis of the quadratic estimator in the context of both cosmology and in a more generalized setting of estimating random field non-stationarity.
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