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arXiv · 0706.2215

Constraints on the spectral index for the inflation models in string landscape

Qing-Guo Huang
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Abstract

We conjecture that the inflation models with trans-Planckian excursions in the field space should be in the swampland. We check this conjecture in a few examples and investigate the constraints on the spectral index for the slow-roll inflation model in string landscape where the variation of inflaton during the period of inflation is less than the Planck scale $M_p$. A red primordial power spectrum with a lower bound on the spectral index is preferred. Both the tensor-scalar ratio and the running can be ignored.

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Qing-Guo Huang. 2007-08-14. Constraints on the spectral index for the inflation models in string landscape. https://doi.org/10.1103/physrevd.76.061303

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