Skewness in CMB temperature fluctuations from curved cosmic super-strings - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: We compute the one-point probability distribution function of small-anglecosmic microwave background temperature fluctuations due to curved cosmicsuper-strings with a simple model of string network by performing Monte Carlosimulations. Taking into account of the correlation between the curvature andthe velocity of string segments, there appear non-Gaussian features,specifically non-Gaussian tails and a skewness, in the one-point pdf. Theobtained sample skewness for the conventional field-theoretic cosmic strings is$g 1\approx -0.14$, which is consistent with the result reported by Fraisse etal

We also discuss the dependence of the pdf on the intercommutingprobability. We find that the standard deviation of the Gaussian part increasesand non-Gaussian features are suppressed as the intercommuting probabilitydecreases. For sufficiently small intercommuting probability, the skewness isgiven by $\lesssim$ a\ few $\times 10^{-2}$.



Autor: Daisuke Yamauchi, Yuuiti Sendouda, Chul-Moon Yoo, Keitaro Takahashi, Atsushi Naruko, Misao Sasaki

Fuente: https://arxiv.org/







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