Measuring bias - 2: Bispectrum

(with Verde, Heavens, Matarrese)

Two-point correlations:

< d1 d2 > = x : FT = P(k) power spectrum

Three-point correlations:

< d1 d2 d3 > = z : FT = B(k1,k2,k3) bispectrum

= 0 for Gaussian field. Measure of gravitational nonlinearity

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