The complete bispectrum of cobe-dmr four year maps

We extend a previous bispectrum analysis of the COBE-DMR 4 year maps, allowing for the presence of correlations between all possible angular scales. We find that the non-Gaussian signal found earlier for bispectrum components including adjacent modes does not extend to triplets of modes with larger separations. Indeed for all separations

\Delta\ell >1

we find that the COBE-DMR data is very Gaussian. The implication seems to be that the previously detected non-Gaussian scale-scale correlation falls off very quickly with mode separation.

References(3)

Figures(0)

Nongaussian isocurvature perturbations from inflation

- Phys.Rev.D 56 (1997) R535-R539
•
e-Print:
- astro-ph/9610219
•
DOI:
- 10.1103/PhysRevD.56.R535

Where is the COBE maps' non-gaussianity?

- AIP Conf.Proc. 478 (1999) 1, 176
•
e-Print:
- astro-ph/9903051
•
DOI:
- 10.1063/1.59447

Cold dark matter cosmology with nonGaussian fluctuations from inflation

D.S. Salopek
(
- Cambridge U. and
- Fermilab
)

- Phys.Rev.D 45 (1992) 1139-1157
•
DOI:
- 10.1103/PhysRevD.45.1139