Figure 1

Scalar potential of the KL model for the values of the parameters $A=B=1$, $a=\pi /25$, $b=\pi /10$ as a function of the canonically normalized volume modulus field $\sqrt{3/2}\ln \sigma$.Reuse & Permissions

Figure 2

The first of these plots shows the potential with the parameters in (23) as a function of $\varphi$ and $\sigma$. The Kähler potential has $K_{S\overline{S}S\overline{S}}=0$ (no stabilization of $s$, as in 6). For each value of $\varphi$ and $\sigma$, $s$ is adjusted so that the potential is minimized. The red line shows the inflaton trajectory. Inflation is possible for $|\varphi |<140$; further increase of $\varphi$ destabilizes the potential. The second plot corresponds to the situation where we stabilize $s$ near $s=0$ by taking $K_{S\overline{S}S\overline{S}}=-4$. We increase $A$ and $B$ by a factor of 5, to increase the height of the barrier. In this regime inflation is possible for $\varphi$ well above 1000, in Planck units. In the investigation of the observational consequences of inflation in this regime one can ignore the KL potential and use the results of the previous investigation of chaotic inflation in supergravity [9, 10].Reuse & Permissions