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arXiv · 1202.0896

Stability of the 3-form field during inflation

Antonio De Felice·Khamphee Karwan·Pitayuth Wongjun
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Abstract

We consider the minimally coupled 3-form field which has been considered as a candidate to realize inflation. We have studied the conditions to avoid ghosts and Laplacian instabilities and found that some classes of potentials, e.g. the Mexican-hat one, will in general be unstable. We then propose other classes of potentials which are instead free from any instability, drive a long-enough slow-roll regime followed by an oscillatory epoch, and as a consequence, can provide successful inflation. Finally, we also provide stable potentials which lead to a small enough propagation speed for the scalar perturbations, giving a possibility for these models to produce non-Gaussianities.

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Antonio De Felice, Khamphee Karwan, Pitayuth Wongjun. 2012-07-17. Stability of the 3-form field during inflation. https://doi.org/10.1103/physrevd.85.123545

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