Inflationary potentials in DBI models

Dennis Bessada, William H. Kinney, Konstantinos Tzirakis

We study DBI inflation based upon a general model characterized by a power-law flow parameter $\epsilon (\varphi )\propto {\varphi }^{\alpha }$ and speed of sound $c_s(\varphi )\propto {\varphi }^{\beta }$, where $\alpha$ and $\beta$ are constant…