Limits on f_NL parameters from WMAP 3yr data

Details Limits on f_NL parameters from WMAP 3yr data Limits on f_NL parameters from WMAP 3yr data

2006-10-19

arxiv.org/abs/astro-ph/0610600v2

JCAP 0703:005,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures; v2: added some comments and equations, corrected the comments on the constraint on the speed of sound

Scientific paper

10.1088/1475-7516/2007/03/005

We analyze the 3-year WMAP data and look for a deviation from Gaussianity in the form of a 3-point function that has either of the two theoretically motivated shapes: local and equilateral. There is no evidence of departure from Gaussianity and the analysis gives the presently tightest bounds on the parameters f_ NL^local and f_NL^equil., which define the amplitude of respectively the local and the equilateral non-Gaussianity: -36 < f_NL^local < 100, -256 < f_NL^equil. < 332 at 95% C.L.

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