Primordial Non-Gaussianity in the Cosmic Microwave Background

Figure 3

Shapes of non-Gaussianity. The shape function 𝐹(𝑘₁,𝑘₂,𝑘₃) forms a triangle in Fourier space. The triangles are parametrized by rescaled Fourier modes, 𝑥₂=𝑘₂/𝑘₁ and 𝑥₃=𝑘₃/𝑘₁. Figure is from [40].