Dilaton assisted two-field inflation from no-scale supergravity

We present a two-field inflation model where the inflaton field has a noncanonical kinetic term due to the presence of a dilaton field. It is a two-parameter generalization of one-parameter Brans-Dicke gravity in the Einstein frame. We show that in such an inflation model the quartic and quadratic i...

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Veröffentlicht in:Physical review. D 2016-07, Vol.94 (2), Article 023521
Hauptverfasser: Chakravarty, Girish Kumar, Das, Suratna, Lambiase, Gaetano, Mohanty, Subhendra
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Sprache:eng
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Zusammenfassung:We present a two-field inflation model where the inflaton field has a noncanonical kinetic term due to the presence of a dilaton field. It is a two-parameter generalization of one-parameter Brans-Dicke gravity in the Einstein frame. We show that in such an inflation model the quartic and quadratic inflaton potentials, which are otherwise ruled out by the present Planck-Keck/BICEP2 data, yield the scalar spectral index and tensor-to-scalar ratio in accordance with the present data. Such a model yields a tensor-to-scalar ratio of the order of 10 super(-2) which is within the reach of B-mode experiments like Keck/BICEP3, CMBPol and thus can be put to the test in the near future. This model yields negligible non-Gaussianity and no isocurvature perturbations up to slow-roll approximation. Finally, we show that such a model can be realized in the realm of no-scale supergravity.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.94.023521