Abstract
We review methods for detecting microwave background non-Gaussianity based on the three-point function in harmonic space – the bispectrum. We concentrate on two methods, one of which is optimised to minimise the error bars on bispectrum estimates, and the other, the pseudo-bispectrum, which is more straighforward to calculate, but which has larger error bars. Application to the MAXIMA dataset shows the map is consistent with Gaussian, with measurements of the weak non-Gaussianity parameter given by the two methods as f NL=1500±950 and f NL=2700±1650, respectively.
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