General CMB bispectrum analysis using wavelets and separable modes

Understand

In this paper we combine partial-wave (`modal') methods with a wavelet analysis of the CMB bispectrum.

• Our implementation exploits the advantages of both approaches to produce robust, reliable and efficient estimators which can constrain the amplitude of arbitrary primordial bispectra.
• This will be particularly important for upcoming surveys such as \emph{Planck}.
• A key advantage is the computational efficiency of calculating the inverse covariance matrix in wavelet space, producing an error bar which is close to optimal.