Skewness in CMB temperature fluctuations from curved cosmic (super-)strings

Abstract

We compute the one-point probability distribution function of small-angle cosmic microwave background temperature fluctuations due to curved cosmic (super-)strings with a simple model of string network by performing Monte Carlo simulations. Taking into account of the correlation between the curvature and the velocity of string segments, there appear non-Gaussian features, specifically non-Gaussian tails and a skewness, in the one-point pdf. The obtained sample skewness for the conventional field-theoretic cosmic strings is $g_1\approx -0.14$, which is consistent with the result reported by Fraisse et al.. We also discuss the dependence of the pdf on the intercommuting probability. We find that the standard deviation of the Gaussian part increases and non-Gaussian features are suppressed as the intercommuting probability decreases. For sufficiently small intercommuting probability, the skewness is given by $\lesssim$ (a\ few) $\times 10^{-2}$.

21 pages, 8 figures; revised version of the manuscript, accepted for publication in JCAP

References in corpus (8)

• Cosmic Strings and Superstrings
• Fitting CMB data with cosmic strings and inflation
• Small-Angle CMB Temperature Anisotropies Induced by Cosmic Strings
• Universal Reconnection of Non-Abelian Cosmic Strings
• The CMB temperature bispectrum induced by cosmic strings
• CMB temperature trispectrum of cosmic strings
• Kinematic Constraints on Formation of Bound States of Cosmic Strings - Field Theoretical Approach
• Cosmic String Power Spectrum, Bispectrum and Trispectrum

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