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• W2217481010 endingPage "026" @default.
• W2217481010 startingPage "026" @default.
• W2217481010 abstract "Employing the covariant formalism, we derive the evolution equations for two scalar fields with non-canonical field space metric up to third order in perturbation theory. These equations can be used to derive predictions for local bi- and trispectra of multi-field cosmological models. Our main application is to ekpyrotic models in which the primordial curvature perturbations are generated via the non-minimal entropic mechanism. In these models, nearly scale-invariant entropy perturbations are generated first due to a non-minimal kinetic coupling between two scalar fields, and subsequently these perturbations are converted into curvature perturbations. Remarkably, the entropy perturbations have vanishing bi- and trispectra during the ekpyrotic phase. However, as we show, the conversion process to curvature perturbations induces local non-Gaussianity parameters fNL and gNL at levels that should be detectable by near-future observations. In fact, in order to obtain a large enough amplitude and small enough bispectrum of the curvature perturbations, as seen in current measurements, the conversion process must be very efficient. Interestingly, for such efficient conversions the trispectrum parameter gNL remains negative and typically of a magnitude (102)–(103), resulting in a distinguishing feature of non-minimally coupled ekpyrotic models." @default.
• W2217481010 created "2016-06-24" @default.
• W2217481010 creator A5066916947 @default.
• W2217481010 creator A5076261692 @default.
• W2217481010 date "2016-01-15" @default.
• W2217481010 modified "2023-09-23" @default.
• W2217481010 title "The non-minimal ekpyrotic trispectrum" @default.
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• W2217481010 doi "https://doi.org/10.1088/1475-7516/2016/01/026" @default.
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