Primordial Non-Gaussianity (fNL) in WMAP data

Details Primordial Non-Gaussianity (fNL) in WMAP data Primordial Non-Gaussianity (fNL) in WMAP data

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..apr.j8001y&link_type=abstract

American Physical Society, 2008 APS April Meeting and HEDP/HEDLA Meeting, April 11-15, 2008, abstract #J8.001

Physics

Scientific paper

We present evidence for the detection of primordial non- Gaussianity of the local type (fNL), using the temperature information of the Cosmic Microwave Background (CMB) from the WMAP 3-year data. We employ the bispectrum estimator of non- Gaussianity described in Yadav et al. 2007 which allows us to analyze the entirety of the WMAP data without an arbitrary cut- off in angular scale. Using the combined information from WMAP's two main science channels up to lmax=750 and the conservative Kp0 foreground mask we find 26.9 < fNL < 146.7 at 95 % C.L., with a central value of fNL=86.8. This corresponds to a rejection of fNL=0 at more than 99.5% significance. We find that this detection is robust to variations in lmax, frequency and masks. We conclude that the WMAP 3-year data disfavors single field slow- roll inflation.

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