 Starobinsky inflation

Starobinsky inflation is an inflationary model whose Einstein-frame scalar potential can be writtenThe exponentially flat large-field plateau supports slow-roll inflation, while the potential is quadratic near its minimum.

Starobinsky inflation is a theoretical model of cosmic inflation proposed by Russian physicist Alexei Starobinsky in the early 1980s. This model provides an explanation for the rapid expansion of the early universe, which is thought to have occurred just after the Big Bang. The key features of Starobinsky inflation include: 1. **Scalar Curvature Action**: The model is based on a modification of Einstein's general relativity which includes a scalar curvature term in the action.