Inflationary model in minimally modified gravity theories

Understand

We have investigated inflationary model constructed from minimally modified gravity (MMG) theories.

• The MMG theory in the form of $f({\bf H}) \propto {\bf H}^{1+p}$ gravity where, ${\bf H}$ is the Hamiltonian constraint in the Einstein gravity and $p$ is constant, has been studied.
• An inflation is difficult to be achieved in this theory of gravity unless an additional scalar field playing a role of inflaton is introduced in the model.
• We have found that the inflaton with exponential potential can drive inflation with graceful exist different from the case of Einstein gravity.