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Published online by Cambridge University Press: 10 December 2020
In this chapter we present an introduction to the vast subject of non-Gaussian perturbations. We mainly concentrate on the bispectrum and the trispectrum. We define some standard shapes of the bispectrum in Fourier space and translate them to angular space. For a description of arbitrary N-point function in the sky we introduce a basis of rotation-invariant functions on the sphere in Appendix 4. This chapter has been added in the second edition.
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