Scale dependences of local form non-Gaussianity parameters from a DBI isocurvature field

Abstract

We derive the spectral indices and their runnings of local form $f_{NL}$ and $g_{NL}$ from a DBI isocurvature field and we find that the indices are suppressed by the sound speed $c_s$. This effect can be interpreted by the Lorentz boost from the viewpoint in the frame where brane is moving.

12 pages, 1 figure

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Cited by in corpus (3)

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• Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys