]>Ekpyrotic Nongaussianity: A Review : Figure 5
903907.fig.005
Figure 5: After the ekpyrotic phase, the trajectory in scalar field space enters the kinetic phase and bends - this bending is described by the existence of an effective repulsive potential (the potentials are indicated by their contour lines). A trajectory adjacent to the background evolution can be characterized by the entropy perturbation 𝛿 𝑠 ( 𝑡 𝑒 𝑘 − e n d ) at the end of the ekpyrotic phase, leading to a corresponding off-set 𝛿 𝑠 ( 𝑡 b e n d ) , or equivalently 𝛿 𝑉 ( 𝑡 b e n d ) , at the time of bending.