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

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.

preprint2011arXivOpen access
Qing-Guo HuangChunshan Lin
astro-ph.COhep-phgr-qchep-th
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Qing-Guo HuangChunshan Lin

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