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

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

2011-08-23

arxiv.org/abs/1108.4474v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 1 figure

Scientific paper

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.

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