Next, a few words about our strategy. It is well recognized now that one has to go beyond the Einstein-Hilbert action for gravity, both from the experimental viewpoint (eg.,because of Dark Energy) and from the theoretical viewpoint (eg., because of the UV incompleteness of quantized Einstein gravity, and the need of its unification with the Standard Model of Elementary Particles). In our approach, the origin of inflation is purely geometrical, ie. is closely related to space-time and gravity. It can be technically accomplished by taking into account the higher-order curvature terms on the left-hand-side of Einstein equations, and extending gravity to supergravity. The higher-order curvature terms are supposed.
