Tuesday, March 20, 2012

1108.2265 (Rebecca J. Danos et al.)

Canny Algorithm: A New Estimator for Primordial Non-Gaussianities    [PDF]

Rebecca J. Danos, Andrew R. Frey, Yi Wang
We utilize the Canny edge detection algorithm as an estimator for primordial non-Gaussianities. In preliminary tests on simulated sky patches with a window size of 57 degrees and multipole moments $l$ up to 1024, we find a $3\sigma$ distinction between maps with local non-Gaussianity $f_{NL}=350$ (or $f_{NL}=-700$) and Gaussian maps. We present evidence that high resolution CMB studies will strongly enhance the sensitivity of the Canny algorithm to non-Gaussianity, making it a promising technique to estimate primordial non-Gaussianity.
View original: http://arxiv.org/abs/1108.2265

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