Working in the Large Volume Scenario (LVS) of IIB Calabi-Yau flux compactifications, we construct inflationary models from recently computed higher derivative $(\alpha')^3$-corrections. Inflation is driven by a Kaehler modulus whose potential arises from the aforementioned corrections, while we use the inclusion of string loop effects just to ensure the existence of a graceful exit when necessary. The effective inflaton potential takes a Starobinsky-type form $V=V_0(1-e^{-\nu\phi})^2$, where we obtain one set-up with $\nu=-1/\sqrt{3}$ and one with $\nu=2/\sqrt{3}$ corresponding to inflation occurring for increasing or decreasing $\phi$ respectively. The inflationary observables are thus in perfect agreement with PLANCK, while the two scenarios remain observationally distinguishable via slightly varying predictions for the tensor-to-scalar ratio $r$. Both set-ups yield $r\simeq (2\ldots 7)\,\times 10^{-3}$. They hence realise inflation with moderately large fields $\left(\Delta\phi\sim 6\thinspace M_{Pl}\right)$ without saturating the Lyth bound. Control over higher corrections relies in part on tuning underlying microscopic parameters, and in part on intrinsic suppressions. The intrinsic part of control arises as a leftover from an approximate effective shift symmetry at parametrically large volume.
翻译:在IIB Calabi-Yau 通缩压缩大容量假设( LVS) 中, 我们从最近计算的高衍生物$( ALpha') =3$( sqrt{3}) 校正中构建了通胀模型。 通胀由Kaehler modulus驱动, 其潜力来自上述校正, 而我们使用包含字符串环效应来确保在必要时有一个优雅的退出。 有效的膨胀潜力需要一种Starobinsky型的 $V=0 (1- e_\\\\\\\\\\ nu\ literalflical conformations, $1\\\ licallical=1\ lical transfil 3} 。 通胀观察效果与PlanCK 完全一致, 而两种情景通过微量的左比值( 美元) =V_ 0 (1- cal- cal) combilates restical res resualal transadal duction $2\ main relial remailding part.