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Two-Field Analysis of No-Scale Supergravity Inflation

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 spe...

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Detalles Bibliográficos
Autores principales: Ellis, John, García, Marcos A.G., Nanopoulos, Dimitri V., Olive, Keith A.
Lenguaje:eng
Publicado: 2014
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1475-7516/2015/01/010
http://cds.cern.ch/record/1951105
Descripción
Sumario: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 K\"ahler 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.