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How Thermal Inflation can save Minimal Hybrid Inflation in Supergravity · Around

2016

How Thermal Inflation can save Minimal Hybrid Inflation in Supergravity

Dimopoulos, Konstantinos, Owen, Charlotte

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Minimal hybrid inflation in supergravity has been ruled out by the 2015 Planck observations because the spectral index of the produced curvature perturbation falls outside observational bounds.

To resurrect the model, a number of modifications have been put forward but many of them spoil the accidental cancellation that resolves the eta-problem and require complicated Kahler constructions to counterbalance the lost cancellation.
In contrast, in this paper the model is rendered viable by supplementing the scenario with a brief period of thermal inflation, which follows the reheating of primordial inflation.
The scalar field responsible for thermal inflation requires a large non-zero vacuum expectation value (VEV) and a flat potential.

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K. Dimopoulos and C. Owen, arXiv:1607.02469 [hep-ph]
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B. Garbrecht, C. Pallis and A. Pilaftsis, JHEP 0612
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