Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-18
Mon.Not.Roy.Astron.Soc. 339 (2003) 1189
Astronomy and Astrophysics
Astrophysics
accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2003.06269.x
Nonlinearity introduced in slow-roll inflation will produce weakly non-Gaussian CMB temperature fluctuations. We have simulated non-Gaussian large scale CMB maps (including COBE-DMR constraints) introducing an additional quadratic term in the gravitational potential.The amount of nonlinearity being controlled by the so called nonlinear coupling parameter f_{nl}. An analysis based on the Spherical Mexican Hat wavelet was applied to these and to the COBE-DMR maps. Skewness values obtained at several scales were combined into a Fisher discriminant. Comparison of the Fisher discriminant distributions obtained for different nonlinear coupling parameters with the COBE-DMR values, sets a constraint of abs(f_{nl})<1100 at the 68% confidence level. This new constraint being tighter than the one previously obtained by using the bispectrum by Komatsu et al. (2002).
Argüeso Francisco
Banday Anthony J.
Cayón Laura
Górski Kris M.
Martinez-Gonzalez Enrique
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