Primordial Non-Gaussianity in the Cosmic Microwave Background
Figure 5
Plot of the function for the inflation with higher derivatives as given by (22) (a) and the ghost inflation as given by (23) (b). The figures are normalized to have value 1 for equilateral configurations and set to zero outside the region . Here and . The figures are taken from Babich et al. 2003 [86].