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Primordial non-Gaussianity

{title2=$B(k_1,k_2,k_3)$}
{wiki=Bispectrum}

Statistical homogeneity defines the primordial bispectrum by
$$
\langle\phi_{\mathbf k_1}\phi_{\mathbf k_2}\phi_{\mathbf k_3}\rangle
=(2\pi)^3\delta^{(3)}(\mathbf k_1+\mathbf k_2+\mathbf k_3)
B(k_1,k_2,k_3).
$$


Primordial bispectrum

Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 312 / 1 / ii / Solution

Primordial bispectrum ( $B (k_{1}, k_{2}, k_{3})$ )

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Primordial bispectrum (B(k1​,k2​,k3​))

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