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Running Non-Gaussianities in DBI Inflation
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We study the non-Gaussianity in the simplest infrared (IR) model of the DBI inflation. We show that the non-Gaussianity in such a model is compatible with the current observational bound, and is within the sensitivity of future experiments. We also discuss the scale dependence of the non-Gaussianity. In the DBI inflation, such a feature can be used as a probe to the properties of the background geometry of the extra dimensions or internal space.
Forward citations
Cited by 3 Pith papers
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Searching for Folded Primordial Non-Gaussianity with Galaxy Surveys
The galaxy bispectrum, not the power spectrum, is the main probe of folded primordial non-Gaussianity; narrow folded signals are washed out by Fourier-space binning.
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Large non-Gaussianities corresponding to first-order phase transitions during inflation
First-order phase transitions in a spectator field during inflation can imprint order-one non-Gaussianity on the curvature perturbation, with a mild scale dependence.
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Constraints on DBI dark energy with chameleon mechanism
DBI dark energy with a chameleon coupling is mildly disfavored against ΛCDM using DESI DR2, DES Y5, Pantheon Plus, and Planck data, with self-interaction consistent with zero.
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