Non-Gaussianity from Particle Production during Inflation
Figure 14
The shape function , defined by (132), as a function of the dimensionless quantities which parametrize the shape of the triangle. (a) corresponds to , (b) is , (c) is , and (d) is . In the IR () the shape of the bispectrum is similar to the equilateral shape; however, there is also some support on flattened triangles near . At larger values of the shape is unlike any other template proposed in the literature.