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arXiv · 1501.05812

Challenges for Large-Field Inflation and Moduli Stabilization

Wilfried Buchmuller·Emilian Dudas·Lucien Heurtier·Alexander Westphal·Clemens Wieck·Martin Wolfgang Winkler
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Abstract

We analyze the interplay between Kähler moduli stabilization and chaotic inflation in supergravity. While heavy moduli decouple from inflation in the supersymmetric limit, supersymmetry breaking generically introduces non-decoupling effects. These lead to inflation driven by a soft mass term, $m_φ^2 \sim m m_{3/2}$, where $m$ is a supersymmetric mass parameter. This scenario needs no stabilizer field, but the stability of moduli during inflation imposes a large supersymmetry breaking scale, $m_{3/2} \gg H$, and a careful choice of initial conditions. This is illustrated in three prominent examples of moduli stabilization: KKLT stabilization, Kähler Uplifting, and the Large Volume Scenario. Remarkably, all models have a universal effective inflaton potential which is flattened compared to quadratic inflation. Hence, they share universal predictions for the CMB observables, in particular a lower bound on the tensor-to-scalar ratio, $r \gtrsim 0.05$.

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Wilfried Buchmuller, Emilian Dudas, Lucien Heurtier, Alexander Westphal, Clemens Wieck, Martin Wolfgang Winkler. 2015-02-06. Challenges for Large-Field Inflation and Moduli Stabilization. https://doi.org/10.1007/jhep04(2015)058

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