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arXiv · 1409.8197

Two-Field Analysis of No-Scale Supergravity Inflation

John Ellis·Marcos A. G. Garcia·Dimitri V. Nanopoulos·Keith A. Olive
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Abstract

Since the building-blocks of supersymmetric models include chiral superfields containing pairs of effective scalar fields, a two-field approach is particularly appropriate for models of inflation based on supergravity. In this paper, we generalize the two-field analysis of the inflationary power spectrum to supergravity models with arbitrary Kähler potential. We show how two-field effects in the context of no-scale supergravity can alter the model predictions for the scalar spectral index $n_s$ and the tensor-to-scalar ratio $r$, yielding results that interpolate between the Planck-friendly Starobinsky model and BICEP2-friendly predictions. In particular, we show that two-field effects in a chaotic no-scale inflation model with a quadratic potential are capable of reducing $r$ to very small values $\ll 0.1$. We also calculate the non-Gaussianity measure $f_{\rm NL}$, finding that is well below the current experimental sensitivity.

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John Ellis, Marcos A. G. Garcia, Dimitri V. Nanopoulos, Keith A. Olive. 2014-09-29. Two-Field Analysis of No-Scale Supergravity Inflation. https://doi.org/10.1088/1475-7516%2F2015%2F01%2F010

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